What does RELATION mean?

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”
4. an act of narration“he was the hero according to his own relation”
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 amended complaint to the time the initial complaint was filed”
6. (usually plural) mutual dealings or connections among persons or groups“international relations”