Noun
1. an abstraction belonging to or characteristic of two entities or parts together
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
3. a person related by blood or marriage;
"police are searching for relatives of the deceased""he has distant relations back in New Jersey"4. an act of narration;
"he was the hero according to his own relation""his endless recounting of the incident eventually became unbearable"5. (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 ammended complaint to the time the initial complaint was filed"6. (usually plural) mutual dealings or connections among persons or groups;
"international relations"