A personal relationship between two people.
Matching each member of one set with exactly one member of another set.
Injective, being an injection: having the property that no two elements of the domain are mapped to the same image.
Involving direct communication between two people.
A conversation marked by a series of witty retorts.
Skill in replying swiftly and wittily.
A swift, witty reply, especially one that is amusing.
To have a repartee (conversation marked by repartees)
To reply with a repartee