IPA: /ˈwɜːrkmeɪt/
KK: /ˈwɜrkˌmeɪt/
A person who works with you, especially in the same company or organization.
I often have lunch with my workmate to discuss our projects.
Workmate → It is formed from "work" (from Old English *weorc*, meaning labor or effort) and "mate" (from Old English *gemetta*, meaning companion or associate). The word "workmate" refers to a companion or associate with whom one shares work or labor.
Think of a 'companion' ('mate') you share 'labor' ('work') with — that's what a workmate is.