The Collaborative International Dictionary of English v.0.48:

Pit \Pit\, n. [OE. pit, put, AS. pytt a pit, hole, L. puteus a
   well, pit.]
   1. A large cavity or hole in the ground, either natural or
      artificial; a cavity in the surface of a body; an
      indentation; specifically:
      (a) The shaft of a coal mine; a coal pit.
      (b) A large hole in the ground from which material is dug
          or quarried; as, a stone pit; a gravel pit; or in
          which material is made by burning; as, a lime pit; a
          charcoal pit.
      (c) A vat sunk in the ground; as, a tan pit.
          [1913 Webster]

                Tumble me into some loathsome pit. --Shak.
          [1913 Webster]

   2. Any abyss; especially, the grave, or hades.
      [1913 Webster]

            Back to the infernal pit I drag thee chained.
                                                  --Milton.
      [1913 Webster]

            He keepth back his soul from the pit. --Job xxxiii.
                                                  18.
      [1913 Webster]

   3. A covered deep hole for entrapping wild beasts; a pitfall;
      hence, a trap; a snare. Also used figuratively.
      [1913 Webster]

            The anointed of the Lord was taken in their pits.
                                                  --Lam. iv. 20.
      [1913 Webster]

   4. A depression or hollow in the surface of the human body;
      as:
      (a) The hollow place under the shoulder or arm; the
          axilla, or armpit.
      (b) See Pit of the stomach (below).
      (c) The indentation or mark left by a pustule, as in
          smallpox.
          [1913 Webster]

   5. Formerly, that part of a theater, on the floor of the
      house, below the level of the stage and behind the
      orchestra; now, in England, commonly the part behind the
      stalls; in the United States, the parquet; also, the
      occupants of such a part of a theater.
      [1913 Webster]

   6. An inclosed area into which gamecocks, dogs, and other
      animals are brought to fight, or where dogs are trained to
      kill rats. "As fiercely as two gamecocks in the pit."
      --Locke.
      [1913 Webster]

   7. [Cf. D. pit, akin to E. pith.] (Bot.)
      (a) The endocarp of a drupe, and its contained seed or
          seeds; a stone; as, a peach pit; a cherry pit, etc.
      (b) A depression or thin spot in the wall of a duct.
          [1913 Webster]

   Cold pit (Hort.), an excavation in the earth, lined with
      masonry or boards, and covered with glass, but not
      artificially heated, -- used in winter for the storing and
      protection of half-hardly plants, and sometimes in the
      spring as a forcing bed.

   Pit coal, coal dug from the earth; mineral coal.

   Pit frame, the framework over the shaft of a coal mine.

   Pit head, the surface of the ground at the mouth of a pit
      or mine.

   Pit kiln, an oven for coking coal.

   Pit martin (Zool.), the bank swallow. [Prov. Eng.]

   Pit of the stomach (Anat.), the depression on the middle
      line of the epigastric region of the abdomen at the lower
      end of the sternum; the infrasternal depression.

   Pit saw (Mech.), a saw worked by two men, one of whom
      stands on the log and the other beneath it. The place of
      the latter is often in a pit, whence the name.

   pit stop, See pit stop in the vocabulary.

   Pit viper (Zool.), any viperine snake having a deep pit on
      each side of the snout. The rattlesnake and copperhead are
      examples.

   Working pit (Min.), a shaft in which the ore is hoisted and
      the workmen carried; -- in distinction from a shaft used
      for the pumps.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pit \Pit\, v. t. [imp. & p. p. Pitted; p. pr. & vb. n.
   Pitting.]
   1. To place or put into a pit or hole.
      [1913 Webster]

            They lived like beasts, and were pitted like beasts,
            tumbled into the grave.               --T. Grander.
      [1913 Webster]

   2. To mark with little hollows, as by various pustules; as, a
      face pitted by smallpox.
      [1913 Webster]

   3. To introduce as an antagonist; to set forward for or in a
      contest; as, to pit one dog against another.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pit
    n 1: a sizeable hole (usually in the ground); "they dug a pit to
         bury the body" [syn: pit, cavity]
    2: a concavity in a surface (especially an anatomical
       depression) [syn: pit, fossa]
    3: the hard inner (usually woody) layer of the pericarp of some
       fruits (as peaches or plums or cherries or olives) that
       contains the seed; "you should remove the stones from prunes
       before cooking" [syn: stone, pit, endocarp]
    4: (Christianity) the abode of Satan and the forces of evil;
       where sinners suffer eternal punishment; "Hurl'd
       headlong...To bottomless perdition, there to dwell"- John
       Milton; "a demon from the depths of the pit"; "Hell is paved
       with good intentions"-Dr. Johnson [syn: Hell, perdition,
       Inferno, infernal region, nether region, pit] [ant:
       Heaven]
    5: an enclosure in which animals are made to fight
    6: (commodity exchange) the part of the floor of a commodity
       exchange where trading in a particular commodity is carried
       on
    7: (auto racing) an area at the side of a racetrack where the
       race cars are serviced and refueled
    8: a trap in the form of a concealed hole [syn: pit,
       pitfall]
    9: a surface excavation for extracting stone or slate; "a
       British term for `quarry' is `stone pit'" [syn: pit,
       quarry, stone pit]
    10: lowered area in front of a stage where an orchestra
        accompanies the performers [syn: orchestra pit, pit]
    11: a workplace consisting of a coal mine plus all the buildings
        and equipment connected with it [syn: colliery, pit]
    v 1: set into opposition or rivalry; "let them match their best
         athletes against ours"; "pit a chess player against the
         Russian champion"; "He plays his two children off against
         each other" [syn: pit, oppose, match, play off]
    2: mark with a scar; "The skin disease scarred his face
       permanently" [syn: scar, mark, pock, pit]
    3: remove the pits from; "pit plums and cherries" [syn: pit,
       stone]

Moby Thesaurus II by Grady Ward, 1.0:

342 Moby Thesaurus words for "pit":
   American Stock Exchange, Amex, L, R, Wall Street, abysm, abyss,
   acorn, acting area, agora, alveolation, alveolus, amphitheater,
   antrum, apron, apron stage, arena, armpit, athletic field,
   audience, auditorium, auditory, background, backstage, balcony,
   band shell, bandstand, bank, barrow, basin, bear garden,
   beehive tomb, berry, bird seed, birthmark, blackhead, bleb,
   blemish, blister, board, bone house, bourse, bowl, box, box grave,
   box seat, boxing ring, bridge, bull ring, bulla, burial,
   burial chamber, burial mound, campus, canvas, catacombs, cavity,
   cenotaph, charnel house, chasm, check, cicatrix, circus, cist,
   cist grave, coal mine, cockpit, coliseum, colliery, colosseum,
   comedo, commodity exchange, concave, concavity, congregation,
   corn pit, coulisse, counter, course, crack, crater, craze,
   crevasse, cromlech, crypt, cup, curb, curb exchange, curb market,
   deep, deep six, defacement, defect, deformation, deformity, dent,
   depress, depression, depth, dig, diggings, dimple, dint, dip,
   disfiguration, disfigurement, distortion, dock, dokhma, dolmen,
   dress circle, dressing room, engrave, excavation, exchange,
   exchange floor, fault, fauteuil, feel, field, finish, flaw,
   flaxseed, flies, floor, fly floor, fly gallery, fold, follicle,
   forestage, forum, freckle, fruit, funnel chest, furrow, gallery,
   gold mine, gouge, grain, granular texture, grave, greenroom, grid,
   gridiron, ground, groundling, gulf, gym, gymnasium, hall, hayseed,
   hemangioma, hickey, hippodrome, hole, hollow, hollow shell,
   honeycomb, house, house of death, impress, impression, imprint,
   indent, indentation, indention, indenture, keloid, kernel, kink,
   knub, lacuna, last home, lentigo, lightboard, linseed, lists,
   locale, loge, long home, low green tent, low house, marketplace,
   mastaba, mat, match, mausoleum, milieu, milium, mine, mole,
   monstrance, mummy chamber, nap, narrow house, needle scar, nevus,
   nigger heaven, notch, nub, nut, open cut, open forum, opencast,
   orchestra, orchestra circle, orchestra pit, ossuarium, ossuary,
   outside market, over-the-counter market, palaestra, parade ground,
   paradise, parquet, parquet circle, parterre, passage grave,
   peanut gallery, performing area, pile, pimple, pip, place,
   platform, pock, pocket, pockmark, port-wine mark, port-wine stain,
   precinct, press in, print, prize ring, proscenium,
   proscenium boxes, proscenium stage, protuberance, public square,
   punch, punch bowl, punch in, purlieu, pustule, pyramid, quarry,
   quotation board, range, recess, reliquary, resting place, rift,
   ring, scab, scar, scene, scene of action, scenery, scoop, scratch,
   sebaceous cyst, seed, sepulcher, set back, set in, setting, shaft,
   shaft grave, shag, shell, shrine, sink, sinus, site, socket,
   spectator, sphere, split, squared circle, stadium, stage,
   stage left, stage right, stage set, stage setting, stall, stamp,
   standing room, stock exchange, stock market, stock ticker, stone,
   strawberry mark, structure, stupa, sty, sunken part, surface,
   surface texture, switchboard, tamp, telephone market, terrain,
   texture, the Big Board, the Exchange, the boards, theater,
   theatre stall, third market, ticker, ticker tape, tilting ground,
   tiltyard, tomb, tope, tower of silence, track, trough, tumulus,
   twist, vault, verruca, vesicle, vie, vug, wale, walk, warp, wart,
   weal, weave, well, welt, wen, wheat pit, whitehead, wings, woof,
   workings, wrestling ring, yawning abyss



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

PIT
       Point In Time (DB)


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

PIT
       Programmable Interval Timer


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

PIT

   Language for IBM 650.  (See IT).


Easton's 1897 Bible Dictionary:

Pit
   a hole in the ground (Ex. 21:33, 34), a cistern for water (Gen.
   37:24; Jer. 14:3), a vault (41:9), a grave (Ps. 30:3). It is
   used as a figure for mischief (Ps. 9:15), and is the name given
   to the unseen place of woe (Rev. 20:1, 3). The slime-pits in the
   vale of Siddim were wells which yielded asphalt (Gen. 14:10).


Bouvier's Law Dictionary, Revised 6th Ed (1856):

PIT, fossa. A hole dug in the earth, which was filled with water, and in
which women thieves were drowned, instead of being hung. The punishment of
the pit was formerly common in Scotland.