名詞 coitus:

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
   同義詞：sexual intercourse, intercourse, sex act, copulation, coition, sexual congress, congress, sexual relation, relation, carnal knowledge

co.i.tus

n.（名詞）
Sexual union between a male and a female involving insertion of the penis into the vagina.
性交，交媾：雄性陰莖插入雌性陰道的雌雄性間的交合

來源：
Latin [from past participle of] coore [to copulate]
拉丁語 [] 源自coore的過去分詞 [交配]
co- [co-]
co- [前綴,表.相互.]
ore [to go, come] * see ei-
ore [走，來] *參見 ei-

【引伸】
co.ital
adj.（形容詞）
co.itally
adv.（副詞）