- unionize⇄unionize, verb, -ized,-izing.
- unionize⇄v.i. to join in a labor union.
- unionize⇄v.t. 1. to form into a labor union.
Ex. The first big drive of the new organization will be to unionize white collar workers (Wall Street Journal).
2. to organize under a labor union; bring under the rules of a labor union.