premultiplyPronunciation: /priːˈmʌltɪplʌɪ/Definition of premultiply verb (premultiplies, premultiplying, premultiplied) [with object] Mathematics multiply (a vector, matrix, or element of a group) non-commutatively by a preceding factor. Derivatives premultiplicationPronunciation: /-ˈkɛɪʃ(ə)n/ noun premultiply in other Oxford dictionaries Definition of premultiply in the US English dictionary