Open English Wordnet
Nouns
(n)sexual intercourse, intercourse, sex act, copulation, coitus, coition, sexual congress, sexual relation, relation, carnal knowledgesexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur
(n)relation, telling, recountingan act of narration“he was the hero according to his own relation”, “his endless recounting of the incident eventually became unbearable”
(n)relation back, relation(law) the principle that an act done at a later time is deemed by law to have occurred at an earlier time“his attorney argued for the relation back of the amended complaint to the time the initial complaint was filed”