The same as sexual intercourse. If you don't know that term either, the Wikipedia article on "sexual intercourse" should give you a good overview.
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The domain of the inverse of a relation is the range of the relation. Similarly, the range of the inverse of a relation is the domain of the relation.
difference between relation sehema and relation instance in dbms
No, a function must be a relation although a relation need not be a functions.
A relation doesn't have an "output value", in the sense that a function does. A set of values is either part of the relation, or it isn't.
A prick relation is someone related through marriage and not a blood relation. Brother inlaw etc.