【医】 性交, 交媾

[ noun ]
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>

Intercourse \In"ter*course\, n. [Formerly entercourse, OF.
entrecours commerce, exchange, F. entrecours a reciprocal
right on neighboring lands, L. intercursus a running between,
fr. intercurrere to run between. See {Inter-}, and {Course}.]
1. A commingling; intimate connection or dealings between
persons or nations, as in common affairs and civilities,
in correspondence or trade; communication; commerce;
especially, interchange of thought and feeling;
association; communion.

This sweet intercourse
Of looks and smiles. --Milton.

2. Same as {sexual intercourse}.
[PJC]

{Sexual intercourse}, sexual or carnal connection; coition;
copulation, especially between humans.

Syn: Communication; connection; commerce; communion;
fellowship; familiarity; acquaintance.