multiply
verb
combine by multiplication
“multiply 10 by 15”
Oppositesdividecombine or increase by multiplication
“He managed to multiply his profits”
Synonymsmanifoldhave young (animals) or reproduce (organisms)
“pandas rarely breed in captivity”
Synonymsbreedhave offspring or produce more individuals of a given animal or plant
“The Bible tells people to procreate”
“These bacteria reproduce”
adverb
in several ways; in a multiple manner
“they were multiply checked for errors”
Oppositessingly
Source: WordNet 3.1, Princeton University