Main Entry: mul·ti·plic·i·ty

Pronunciation: \ˌməl-tə-ˈplis-ət-ē\

Function: noun

Inflected Form(s): plural mul·ti·plic·i·ties

1 : the quality or state of being multiple or various
2 : the ratio of the number of infectious particles (as of a bacteriophage) to the number of cells at risk <monolayer cultures…were infected at an effective multiplicity of approximately 100—J. J. Holland>