The Collaborative International Dictionary of English v.0.48:

Top \Top\, n. [CF. OD. dop, top, OHG., MNG., & dial. G. topf;
   perhaps akin to G. topf a pot.]
   1. A child's toy, commonly in the form of a conoid or pear,
      made to spin on its point, usually by drawing off a string
      wound round its surface or stem, the motion being
      sometimes continued by means of a whip.
      [1913 Webster]

   2. (Rope Making) A plug, or conical block of wood, with
      longitudital grooves on its surface, in which the strands
      of the rope slide in the process of twisting.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Top \Top\, n. [AS. top; akin to OFries. top a tuft, D. top top,
   OHG. zopf end, tip, tuft of hair, G. zopf tuft of hair,
   pigtail, top of a tree, Icel. toppr a tuft of hair, crest,
   top, Dan. top, Sw. topp pinnacle, top; of uncertain origin.
   Cf. Tuft.]
   1. The highest part of anything; the upper end, edge, or
      extremity; the upper side or surface; summit; apex;
      vertex; cover; lid; as, the top of a spire; the top of a
      house; the top of a mountain; the top of the ground.
      [1913 Webster]

            The star that bids the shepherd fold,
            Now the top of heaven doth hold.      --Milton.
      [1913 Webster]

   2. The utmost degree; the acme; the summit.
      [1913 Webster]

            The top of my ambition is to contribute to that
            work.                                 --Pope.
      [1913 Webster]

   3. The highest rank; the most honorable position; the utmost
      attainable place; as, to be at the top of one's class, or
      at the top of the school.
      [1913 Webster]

            And wears upon his baby brow the round
            And top of sovereignty.               --Shak.
      [1913 Webster]

   4. The chief person; the most prominent one.
      [1913 Webster]

            Other . . . aspired to be the top of zealots.
                                                  --Milton.
      [1913 Webster]

   5. The crown of the head, or the hair upon it; the head.
      "From top to toe" --Spenser.
      [1913 Webster]

            All the stored vengeance of Heaven fall
            On her ungrateful top !               --Shak.
      [1913 Webster]

   6. The head, or upper part, of a plant.
      [1913 Webster]

            The buds . . . are called heads, or tops, as
            cabbageheads.                         --I. Watts.
      [1913 Webster]

   7. (Naut.) A platform surrounding the head of the lower mast
      and projecting on all sudes. It serves to spead the
      topmast rigging, thus strengheningthe mast, and also
      furnishes a convenient standing place for the men aloft.
      --Totten.
      [1913 Webster]

   8. (Wool Manuf.) A bundle or ball of slivers of comkbed wool,
      from which the noils, or dust, have been taken out.
      [1913 Webster]

   9. Eve; verge; point. [R.] "He was upon the top of his
      marriage with Magdaleine." --Knolles.
      [1913 Webster]

   10. The part of a cut gem between the girdle, or
       circumference, and the table, or flat upper surface.
       --Knight.
       [1913 Webster]

   11. pl. Top-boots. [Slang] --Dickens.
       [1913 Webster]

   12. (Golf)
       (a) A stroke on the top of the ball.
       (b) A forward spin given to the ball by hitting it on or
           near the top.
           [Webster 1913 Suppl.]

   Note: Top is often used adjectively or as the first part of
         compound words, usually self-explaining; as, top stone,
         or topstone; top-boots, or top boots; top soil, or
         top-soil.
         [1913 Webster]

   Top and but (Shipbuilding), a phrase used to denote a
      method of working long tapering planks by bringing the but
      of one plank to the top of the other to make up a constant
      breadth in two layers.

   Top minnow (Zool.), a small viviparous fresh-water fish
      (Gambusia patruelis) abundant in the Southern United
      States. Also applied to other similar species.

   From top to toe, from head to foot; altogether.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Top \Top\, v. t.
   1. To cover on the top; to tip; to cap; -- chiefly used in
      the past participle.
      [1913 Webster]

            Like moving mountains topped with snow. --Waller.
      [1913 Webster]

            A mount
            Of alabaster, topped with golden spires. --Milton.
      [1913 Webster]

   2. To rise above; to excel; to outgo; to surpass.
      [1913 Webster]

            Topping all others in boasting.       --Shak.
      [1913 Webster]

            Edmund the base shall top the legitimate. --Shak.
      [1913 Webster]

   3. To rise to the top of; to go over the top of.
      [1913 Webster]

            But wind about till thou hast topped the hill.
                                                  --Denham.
      [1913 Webster]

   4. To take off the or upper part of; to crop.
      [1913 Webster]

            Top your rose trees a little with your knife.
                                                  --Evelyn.
      [1913 Webster]

   5. To perform eminently, or better than before.
      [1913 Webster]

            From endeavoring universally to top their parts,
            they will go universally beyond them. --Jeffrey.
      [1913 Webster]

   6. (Naut.) To raise one end of, as a yard, so that that end
      becomes higher than the other.
      [1913 Webster]

   7. (Dyeing) To cover with another dye; as, to top aniline
      black with methyl violet to prevent greening and crocking.
      [Webster 1913 Suppl.]

   8. To put a stiffening piece or back on (a saw blade).
      [Webster 1913 Suppl.]

   9. To arrange, as fruit, with the best on top. [Cant]
      [Webster 1913 Suppl.]

   10. To strike the top of, as a wall, with the hind feet, in
       jumping, so as to gain new impetus; -- said of a horse.
       [Webster 1913 Suppl.]

   11. To improve (domestic animals, esp. sheep) by crossing
       certain individuals or breeds with other superior.
       [Webster 1913 Suppl.]

   12. (Naut.) To raise one end of, as a yard, so that that end
       becomes higher than the other.
       [Webster 1913 Suppl.]

   13. To cut, break, or otherwise take off the top of (a steel
       ingot) to remove unsound metal.
       [Webster 1913 Suppl.]

   14. (Golf) To strike (the ball) above the center; also, to
       make (as a stroke) by hitting the ball in this way.
       [Webster 1913 Suppl.]

   To top off,
       (a) to complete by putting on, or finishing, the top or
           uppermost part of; as, to top off a stack of hay;
           hence, to complete; to finish; to adorn.
       (b) to completely fill (an almost full tank) by adding
           more of the liquid it already contains.
           [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Top \Top\, v. i. [imp. & p. p. Topped; p. pr. & vb. n.
   Topping.]
   1. To rise aloft; to be eminent; to tower; as, lofty ridges
      and topping mountains. --Derham.
      [1913 Webster]

   2. To predominate; as, topping passions. "Influenced by
      topping uneasiness." --Locke.
      [1913 Webster]

   3. To excel; to rise above others.
      [1913 Webster]

            But write thy, and top.               --Dryden.
      [1913 Webster]

   4. (Golf) To strike a ball above the center.
      [Webster 1913 Suppl.]

   5. (Naut.) To rise at one end, as a yard; -- usually with up.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

top
    adj 1: situated at the top or highest position; "the top shelf"
           [ant: bottom(a), side(a)]
    n 1: the upper part of anything; "the mower cuts off the tops of
         the grass"; "the title should be written at the top of the
         first page"
    2: the highest or uppermost side of anything; "put your books on
       top of the desk"; "only the top side of the box was painted"
       [syn: top, top side, upper side, upside]
    3: the top or extreme point of something (usually a mountain or
       hill); "the view from the peak was magnificent"; "they
       clambered to the tip of Monadnock"; "the region is a few
       molecules wide at the summit" [syn: peak, crown, crest,
       top, tip, summit]
    4: the first half of an inning; while the visiting team is at
       bat; "a relief pitcher took over in the top of the fifth"
       [syn: top, top of the inning] [ant: bottom, bottom of
       the inning]
    5: the highest level or degree attainable; the highest stage of
       development; "his landscapes were deemed the acme of beauty";
       "the artist's gifts are at their acme"; "at the height of her
       career"; "the peak of perfection"; "summer was at its peak";
       "...catapulted Einstein to the pinnacle of fame"; "the summit
       of his ambition"; "so many highest superlatives achieved by
       man"; "at the top of his profession" [syn: acme, height,
       elevation, peak, pinnacle, summit, superlative,
       meridian, tiptop, top]
    6: the greatest possible intensity; "he screamed at the top of
       his lungs"
    7: platform surrounding the head of a lower mast
    8: a conical child's plaything tapering to a steel point on
       which it can be made to spin; "he got a bright red top and
       string for his birthday" [syn: top, whirligig,
       teetotum, spinning top]
    9: covering for a hole (especially a hole in the top of a
       container); "he removed the top of the carton"; "he couldn't
       get the top off of the bottle"; "put the cover back on the
       kettle" [syn: top, cover]
    10: a garment (especially for women) that extends from the
        shoulders to the waist or hips; "he stared as she buttoned
        her top"
    11: a canvas tent to house the audience at a circus performance;
        "he was afraid of a fire in the circus tent"; "they had the
        big top up in less than an hour" [syn: circus tent, big
        top, round top, top]
    v 1: be superior or better than some standard; "She exceeded our
         expectations"; "She topped her performance of last year"
         [syn: exceed, transcend, overstep, pass, go past,
         top]
    2: pass by, over, or under without making contact; "the balloon
       cleared the tree tops" [syn: clear, top]
    3: be at the top of or constitute the top or highest point; "A
       star tops the Christmas Tree"
    4: be ahead of others; be the first; "she topped her class every
       year" [syn: lead, top]
    5: provide with a top or finish the top (of a structure); "the
       towers were topped with conical roofs" [syn: top, top
       out]
    6: reach or ascend the top of; "The hikers topped the mountain
       just before noon"
    7: strike (the top part of a ball in golf, baseball, or pool)
       giving it a forward spin
    8: cut the top off; "top trees and bushes" [syn: top, pinch]
    9: be the culminating event; "The speech crowned the meeting"
       [syn: crown, top]
    10: finish up or conclude; "They topped off their dinner with a
        cognac"; "top the evening with champagne" [syn: top, top
        off]

Moby Thesaurus II by Grady Ward, 1.0:

355 Moby Thesaurus words for "top":
   Establishment, VIP, acmatic, acme, acme of perfection, agate, all,
   apex, apical, apogee, ball, baron, baseball bat, bat, battledore,
   bauble, beat, best, bestraddle, bestride, better, big gun, big man,
   big name, big top, bigwig, blocks, bonnet, border, brass,
   brass hat, brow, bureaucracy, canvas, cap, capital, carousel, ceil,
   ceiling, celebrity, checkerboard, chessboard, chief, choice,
   circumference, clear, climax, clip, cloud nine, club, cockhorse,
   coif, command, consummate, consummation, cork, cortex, costly,
   cover, covering, cream, crest, cricket bat, crop, crown, crust,
   cue, culmen, culminate, culmination, curtail, cusp, dear,
   dear-bought, dignitary, dignity, directorate, disk, dock, doll,
   doll carriage, dome, dominate, eaves, edge, elder, elite, end,
   envelope, epidermis, exceed, excel, expensive, exterior, external,
   extreme, extreme limit, extremity, facade, face, facet, fancy, fat,
   father, figure, fine, first-class, first-rate, first-string,
   flower, fringe, front, frost, gewgaw, gimcrack, go one better,
   golf club, great man, greatest, hat, head, headmost, heaven,
   heavens, height, hierarchy, high, high noon, high-priced,
   higher echelons, higher-ups, highest, highest degree,
   highest pitch, highest point, hobbyhorse, hood, housetop, ice,
   important person, improve on, integument, interests,
   jack-in-the-box, jacks, jackstones, jackstraws, kickshaw,
   knickknack, lantern, last word, lid, limit, lineaments, lion,
   look down upon, lords of creation, luxurious, magnate, man of mark,
   management, marble, marionette, maximal, maximum, meridian,
   meridional, merry-go-round, mig, ministry, mogul, most,
   mountaintop, nabob, name, ne plus ultra, no place higher, noon,
   not affordable, notability, notable, nth degree, of great cost,
   officialdom, operculum, outdo, outer face, outer layer, outer side,
   outer skin, outline, outshine, outside, outstrip, outtop, outweigh,
   overarch, overbalance, overbear, overcome, overhead, overlook,
   overmost, overpass, overshadow, overtop, panjandrum, paper doll,
   paramount, peak, penthouse, perfect, perfection, periphery,
   person of renown, personage, personality, pick, pick-up sticks,
   pillar of society, pink, pink of perfection, pinnacle, pinwheel,
   pitch, plafond, plaything, point, pole, pollard, power,
   power elite, predominate, preeminent, prelacy, premium,
   preponderate, prevail, pricey, pride, prime, prize, prune, puppet,
   racket, rag doll, rich, ridge, ridgepole, rind, rise above,
   rocking horse, roller, rolling stone, roof, roof garden, roof in,
   roof-deck, roofage, roofing, roofpole, rooftop, rooftree, rotator,
   rotor, round top, roundabout, ruling circle, ruling class,
   ruling classes, rundle, sachem, seventh heaven, shell, shingles,
   shorten, skin, sky, skylight, slates, somebody, something, spire,
   sport, steelie, steep, stiff, stopper, summit, summital, sumptuous,
   superficies, superior, superlative, superstratum, supreme, surface,
   surmount, surpass, taw, teetotum, tent, tentage, the Establishment,
   the administration, the authorities, the great, the ingroup,
   the interests, the people upstairs, the power elite,
   the power structure, the top, the whole, them, they, tiles, tip,
   tip-top, top brass, top off, top people, top-notch, topmost,
   tower above, tower over, toy, toy soldier, transcend, trim,
   trinket, trump, truncate, tycoon, ultimate, unpayable, upmost,
   upper extremity, uppermost, utmost, utmost extent, uttermost,
   vertex, vertical, very important person, very top, wheel,
   whim-wham, whirlabout, whirler, whirligig, whitetop, worthy,
   zenith, zenithal



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

TOP
       Technical and Office Protocols


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

TOP
       The OS-9 Project (OS-9)


The Free On-line Dictionary of Computing (30 December 2018):

Technical/Office Protocol
TOP

   (TOP) An applications layer network application and
   protocol stack for office automation developed by Boeing
   following the OSI model.  This protocol is very similar to
   MAP except at the lowest levels, where it uses Ethernet
   (IEEE 802.3) rather than Token Bus (IEEE 802.4).