Definition of: multiply

(mul′tə·plī) v. ·plied, ·ply·ing v.t.
1. To increase the quantity, amount, or degree of; make more numerous.
2. Math. To perform the operation of multiplication upon.
—v.i.
3. To become more in number, amount, or degree; increase.
4. Math. To perform the operation of multiplication. See synonyms under PROPAGATE.
—adverb So as to be numerous; in many ways. [<OF multiplier <L multiplicare <multiplex. See MULTIPLEX.]
—mul′ti·pli′a·ble adjective