IPA: //ˌmʌltiˈɔːθər//
KK: /mʌltiˈɔːθər/
Describing something that is created or written by multiple authors instead of just one.
The multiauthor book features contributions from several renowned writers.
Multiauthor → It is formed from "multi-" (meaning many) and "author" (from Latin "auctor", meaning creator or originator). The word "multiauthor" refers to a work created by many authors or contributors.
Think of 'many' ('multi-') people who are 'creators' ('author') of a work — that's what multiauthor means.