Merriam-Webster Collegiate Dictionary - intercourse

 noun  Etymology: Middle English intercurse, probably from Middle French entrecours, from Medieval Latin intercursus, from Latin, act of running between, from intercurrere to run between, from inter- + currere to run — more at car  Date: 15th century  1. connection or dealings between persons or groups  2. exchange especially of thoughts or feelings ; communion  3. physical sexual contact between individuals that involves the genitalia of at least one person anal ~ oral ~; especially sexual ~ 1 heterosexual ~