Definition of "Relation" :

noun: an abstraction belonging to or characteristic of two entities or parts together

noun: (usually plural) mutual dealings or connections among persons or groups

"International relations."

noun: sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur

noun: (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."

noun: an act of narration

"He was the hero according to his own relation."

noun: a person related by blood or marriage

"He has distant relations back in New Jersey."