copulation

(zoology) The sexual union of two individuals, resulting in insemination or deposition of the male gametes in proximity to the female gametes.

1. Conjugation between two cells that do not fuse but separate after mutual fertilization.
2. See coitus.

Sexual union or coitus; usually applied to animals other than humans.

• c. behavior — see mating behavior.
• c. tie — genital lock.

The noun has one meaning:

Meaning #1: 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
  Synonyms: sexual intercourse, intercourse, sex act, coitus, coition, sexual congress, congress, sexual relation, relation, carnal knowledge