Quote:
What is a relationship?
re·la·tion·ship/riˈlāSHənˌSHip/
Noun:
The way in which two or more concepts, objects, or people are connected, or the state of being connected.
The state of being connected by blood or marriage.
Synonyms:
connection - connexion - kinship - affinity - kindred
Basically, when you have a relationship with someone, you are close, you have feelings for each other, you're intimate with each other, and, if it goes well, you'll fall in love, which is, to quote David Mitchell, "two people slightly deluded in each other's favour."