co-

prefix Etymology: Middle English, from Latin, from com-; akin to Old English ge-, perfective and collective prefix, Old Irish com- with 1. with ; together ; joint ; jointly <

coexist

> <

coheir

> 2. in or to the same degree <

coextensive

> 3. a. one that is associated in an action with another ; fellow ; partner <

coauthor

> <

coworker

> b. having a usually lesser share in duty or responsibility ; alternate ; deputy <

copilot

> 4. of, relating to, or constituting the complement of an angle <

cosine

>