colleague
UK: ˈkɒliːɡ | US: ˈkɑːliːɡ
n. a person with whom one works in a profession or business
The word "colleague" originates from the Latin collega, meaning "partner in office," derived from com- (together) + legare (to choose or depute). It entered English via Old French collegue in the 16th century. The morpheme "col" (from com-) signifies association, while "league" (from legare) implies a bonded group. Historically, it referred to individuals jointly elected or appointed, evolving to its modern sense of professional peers.
She discussed the project with her colleague during lunch.
My colleague and I co-authored the research paper.
He is respected as a diligent colleague in the department.
The team celebrated the success with their colleagues.
A colleague offered to help me meet the deadline.