Source : Webster's Revised Unabridged Dictionary (1913)

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}.]
   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.

   {Sexual intercourse}, sexual or carnal connection; coition.

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

Source : WordNet®

intercourse
     n 1: communication between individuals [syn: {social intercourse}]
     2: 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}, {sex act}, {copulation}, {coitus}, {coition},
         {sexual congress}, {congress}, {sexual relation}, {relation},
         {carnal knowledge}]