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Wiktionary
unionise

vb. (standard spelling of from=non-Oxford British spelling unionize English)

WordNet
unionise
  1. v. recruit for a union or organize into a union; "We don't allow people to come into our plant and try to unionize the workers" [syn: unionize]

  2. form or join a union; "The autoworkers decided to unionize" [syn: unionize, organize, organise]