Multiply is defined as to cause to increase in number or degree.(verb)
An example of multiply is for a rabbit to continue having babies.
Multiply means in many ways.(adverb)
An example of multiply used as an adverb is in the phrase "multiply exercising," which means a number of ways of exercising.
See multiply in Webster's New World College Dictionary
Origin: ME multiplien < OFr multiplier < L multiplicare < multiplex, multiple
See multiply in American Heritage Dictionary 4
verb mul·ti·plied, mul·ti·ply·ing, mul·ti·plies verb, transitive
Origin: Middle English multiplien
Origin: , from Old French multiplier
Origin: , from Latin multiplicāre
Origin: , from multiplex, multiplex; see multiplex.
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