IPA: /ˌmʌltiˈfæktər/
KK: /mʌltiˈfæktər/
Relating to or involving multiple elements or causes.
The study considered multifactor influences on health outcomes.
Multifactor → It is formed from "multi-" (meaning many) and "factor" (from Latin "facere", meaning to make or do). The word "multifactor" refers to something that involves many factors or elements contributing to a result.
Think of 'many' ('multi-') elements that 'make' ('facere') up a situation — that's why multifactor means involving many contributing elements.