mid-14c., multiplicacioun, "any increase in size, number, or amount; act or process of increasing in number," from Old French multiplicacion (12c.) "multiplication, duplication; multiplicity, diversity," from Latin multiplicationem (nominative multiplicatio), noun of action from past-participle stem of multiplicare "to multiply, increase" (see multiply). The arithmetical sense of "process in which one number is considered as an operator on another" is attested from late 14c.

this multiplication of cells is a natural correlate of growth

repeated copying leads to a multiplication of errors

the multiplication of four by three gives twelve

multiphase

multiple

multiplex

multiplicable

multiplicand

multiplication

multiplicative

multiplicity

multiplier

multi-ply

multiply