noun (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(noun.act)

  Synonym:
  carnal knowledge, coition, coitus, congress, intercourse, relation, sex act, sexual congress, sexual intercourse, sexual relation
  

  source: wordnet30
• The act of coupling or joining; union; conjunction.(noun)

  source: webster1913