LATIN DICTIONARYLexicon Latīnum
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“multiply” in Latin

The English word multiply itself goes back to Latin multus, through multiplicō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

multiply
TRANS., multiplicare. To multiply three by four, tria quater multiplicare; tria quater ducere (☞ not ter quater sumere): to multiply a number by itself, numerum in se (☞ not inter se) multiplicare: to multiply these sums by each other, has summas in se or inter se multiplicare: the breadth multiplied by the length gires 1500 feet, latitudinem cum longitudine multiplicando efficiemus pedes mille et quingentos.
INTRANS., crescere; augeri; augescere; auctibus crescere or augeri.

Quick answer

What is the Latin word for multiply?
The usual Latin words for “multiply” are multiplicō, crēscō, augeō; also augēscō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.