Meaning of UNIONIZE in English

UNIONIZE

u ‧ nion ‧ ize BrE AmE ( also unionise British English ) /ˈjuːnjənaɪz/ verb [intransitive and transitive]

if workers unionize or are unionized, they become members of a ↑ trade union

—unionized adjective

—unionization /ˌjuːnjənaɪˈzeɪʃ ə n $ -jənə-/ noun [uncountable]

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.