What is a replication? (From Shakespeare's Hamlet)

A replication is an answer, reply.

Hamlet: Do not believe it.
Rosencrantz: Believe what?
Hamlet: That I can keep your counsel and not mine own. Besides, to be demanded of a sponge! What replication should be made by the son of a king?
Rosencrantz: Take you me for a sponge, my lord?
From Shakespeare's Hamlet; Act IV, Scene 2.