unionize - definition and synonyms

verb 

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/ˈjuːnjənaɪz/
present tense
I/you/we/theyunionize
he/she/itunionizes
present participleunionizing
past tenseunionized
past participleunionized
  1. [transitive] to organize a group of workers so that they form a trade union

derived word

unionization

 

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/ˌjuːnjənaɪˈzeɪʃ(ə)n/
noun [uncountable]