The Collaborative International Dictionary of English v.0.48:

-or \-or\ suff. [L. -or: cf. OF. -or, -ur, -our, F. -eur.]
   1. A noun suffix denoting an act; a state or quality; as in
      error, fervor, pallor, candor, etc.
      [1913 Webster]

   2. A noun suffix denoting an agent or doer; as in auditor,
      one who hears; donor, one who gives; obligor, elevator. It
      is correlative to -ee. In general -or is appended to words
      of Latin, and -er to those of English, origin. See -er.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Or \Or\ ([^o]r), conj. [OE. or, outher, other, auther, either,
   or, AS. [=a]w[eth]er, contr. from [=a]hwae[eth]er; [=a] aye +
   hwae[eth]er whether. See Aye, and Whether, and cf.
   Either.]
   A particle that marks an alternative; as, you may read or may
   write, -- that is, you may do one of the things at your
   pleasure, but not both. It corresponds to either. You may
   ride either to London or to Windsor. It often connects a
   series of words or propositions, presenting a choice of
   either; as, he may study law, or medicine, or divinity, or he
   may enter into trade.
   [1913 Webster]

         If man's convenience, health,
         Or safety interfere, his rights and claims
         Are paramount.                           --Cowper.
   [1913 Webster]

   Note: Or may be used to join as alternatives terms expressing
         unlike things or ideas (as, is the orange sour or
         sweet?), or different terms expressing the same thing
         or idea; as, this is a sphere, or globe.
         [1913 Webster]

   Note: Or sometimes begins a sentence. In this case it
         expresses an alternative or subjoins a clause differing
         from the foregoing. "Or what man is there of you, who,
         if his son shall ask him for a loaf, will give him a
         stone?" --Matt. vii. 9 (Rev. Ver.).
         [1913 Webster] Or for either is archaic or poetic.
         [1913 Webster]

               Maugre thine heed, thou must for indigence
               Or steal, or beg, or borrow thy dispence.
                                                  --Chaucer.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Or \Or\, prep. & adv. [AS. ?r ere, before. [root]204. See Ere,
   prep. & adv.]
   Ere; before; sooner than. [Obs.]
   [1913 Webster]

         But natheless, while I have time and space,
         Or that I forther in this tale pace.     --Chaucer.
   [1913 Webster]

   Or ever, Or ere. See under Ever, and Ere.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Or \Or\, n. [F., fr. L. aurum gold. Cf. Aureate.] (Her.)
   Yellow or gold color, -- represented in drawing or engraving
   by small dots.
   [1913 Webster]

WordNet (r) 3.0 (2006):

OR
    n 1: a state in northwestern United States on the Pacific [syn:
         Oregon, Beaver State, OR]
    2: a room in a hospital equipped for the performance of surgical
       operations; "great care is taken to keep the operating rooms
       aseptic" [syn: operating room, OR, operating theater,
       operating theatre, surgery]

Moby Thesaurus II by Grady Ward, 1.0:

152 Moby Thesaurus words for "or":
   achievement, alerion, and/or, animal charge, annulet, argent,
   armorial bearings, armory, arms, aureate, aureateness, auric,
   azure, bandeau, bar, bar sinister, baton, bearings, beige, bend,
   bend sinister, billet, blazon, blazonry, bordure, broad arrow,
   buff, buff-yellow, cadency mark, canary, canary-yellow, canton,
   chaplet, charge, chevron, chief, citron, citron-yellow,
   coat of arms, cockatrice, coronet, cream, creamy, crescent, crest,
   cross, cross moline, crown, device, difference, differencing,
   eagle, ecru, ermine, ermines, erminites, erminois, escutcheon,
   falcon, fallow, fallowness, fess, fess point, field, file, flanch,
   flaxen, fleur-de-lis, fret, fur, fusil, garland, gilded, gilt,
   gold, gold-colored, golden, griffin, gules, gyron, hatchment,
   helmet, heraldic device, honor point, impalement, impaling,
   inescutcheon, label, lemon, lemon-yellow, lion, lozenge, luteolous,
   lutescent, mantling, marshaling, martlet, mascle, metal, motto,
   mullet, nombril point, ocherish, ocherous, ochery, ochreous,
   ochroid, ochrous, ochry, octofoil, ordinary, orle, pale, paly,
   pean, pheon, primrose, primrose-colored, primrose-yellow, purpure,
   quarter, quartering, rose, sable, saffron, saffron-colored,
   saffron-yellow, sallow, saltire, sand-colored, sandy, scutcheon,
   shield, spread eagle, straw, straw-colored, subordinary, tenne,
   tincture, torse, tressure, unicorn, vair, vert, wreath, xanthic,
   xanthous, yale, yellow, yellowish, yellowishness, yellowness



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

OR
       Observation Report (CC)


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

OR
       Originator / Recipient (X.400, MOTIS), "O/R"


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

OR

    The Boolean function which is true if any of its
   arguments are true.  Its truth table is:

    A | B | A OR B
    --+---+---------
    F | F |    F
    F | T |    T
    T | F |    T
    T | T |    T

   (1996-11-04)


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

OR. This syllable in the termination of words has an active signification,
and usually denotes the doer of an act; as, the grantor, he who makes a
grant; the vendor, he who makes a sale; the feoffor, he who makes a
feoffment. Litt. s. 57; 1 Bl. Com. 140, n.