Source : Webster's Revised Unabridged Dictionary (1913)

Copulation \Cop`u*la"tion\, n. [L. copulatio: cf. F.
   copulation.]
   1. The act of coupling or joining; union; conjunction.

            Wit, you know, is the unexpected copulation of
            ideas.                                --Johnson.

   2. The coming together of male and female in the act of
      generation; sexual union; coition.

Source : WordNet®

copulation
     n : the act of sexual procreation between a man and a woman; the
         man's penis is inserted into the woman's vagina and
         excited until orgasm and ejaculation occur [syn: {sexual
         intercourse}, {intercourse}, {sex act}, {coitus}, {coition},
          {sexual congress}, {congress}, {sexual relation}, {relation},
          {carnal knowledge}]