Source : Webster's Revised Unabridged Dictionary (1913)

Couple \Cou"ple\, v. t. [imp. & p. p. {Coupled} (k?p"'ld); p.
   pr. & vb. n. {Coupling} (-l?ng).] [F. coupler, fr. L.
   copulare. See {Couple}, n., and cf. {Copulate}, {Cobble}, v.]
   1. To link or tie, as one thing to another; to connect or
      fasten together; to join.

            Huntsman, I charge thee, tender well my hounds, . .
            . And couple Clowder with the deep-mouthed brach.
                                                  --Shak.

   2. To join in wedlock; to marry. [Colloq.]

            A parson who couples all our beggars. --Swift.

Couple \Cou"ple\ (k?p"'l), n. [F. couple, fr. L. copula a bond,
   band; co- + apere, aptum, to join. See {Art}, a., and cf.
   {Copula}.]
   1. That which joins or links two things together; a bond or
      tie; a coupler. [Obs.]

            It is in some sort with friends as it is with dogs
            in couples; they should be of the same size and
            humor.                                --L'Estrange.

            I'll go in couples with her.          --Shak.

   2. Two of the same kind connected or considered together; a
      pair; a brace. ``A couple of shepherds.'' --Sir P. Sidney.
      ``A couple of drops'' --Addison. ``A couple of miles.''
      --Dickens. ``A couple of weeks.'' --Carlyle.

            Adding one to one we have the complex idea of a
            couple.                               --Locke.

            [Ziba] met him with a couple of asses saddled. --2
                                                  Sam. xvi. 1.

   3. A male and female associated together; esp., a man and
      woman who are married or betrothed.

            Such were our couple, man and wife.   --Lloyd.

            Fair couple linked in happy, nuptial league.
                                                  --Milton.

   4. (Arch.) See {Couple-close}.

   5. (Elec.) One of the pairs of plates of two metals which
      compose a voltaic battery; -- called a voltaic couple or
      galvanic couple.

   6. (Mech.) Two rotations, movements, etc., which are equal in
      amount but opposite in direction, and acting along
      parallel lines or around parallel axes.

   Note: The effect of a couple of forces is to produce a
         rotation. A couple of rotations is equivalent to a
         motion of translation.

Couple \Cou"ple\, v. i.
   To come together as male and female; to copulate. [Obs.]
   --Milton. Bacon.

Source : WordNet®

couple
     v 1: bring two objects, ideas, or people together; "This fact is
          coupled to the other one"; "Matchmaker, can you match my
          daughter with a nice young man?"; "The student was
          paired with a partner for collaboration on the project"
          [syn: {match}, {mate}, {pair}, {twin}]
     2: link together; "can we couple these proposals?" [syn: {couple
        on}, {couple up}] [ant: {uncouple}]
     3: form a pair or pairs; "The two old friends paired off" [syn:
         {pair}, {pair off}, {partner off}]
     4: make love; "Birds mate in the Spring" [syn: {copulate}, {mate},
         {pair}]

couple
     n 1: a small indefinite number; "he's coming for a couple of
          days"
     2: a pair of people who live together; "a married couple from
        Chicago" [syn: {mates}, {match}]
     3: a pair who associate with one another; "the engaged couple";
        "an inseparable twosome" [syn: {twosome}, {duo}, {duet}]
     4: two items of the same kind [syn: {pair}, {twosome}, {twain},
         {brace}, {span}, {yoke}, {couplet}, {distich}, {duo}, {duet},
         {dyad}, {duad}]
     5: something joined by two equal and opposite forces that act
        along parallel lines