From Longman Dictionary of Contemporary Englishunionizeu‧nion‧ize (also unionise British English) /ˈjuːnjənaɪz/ verb [intransitive, transitive] BELif workers unionize or are unionized, they become members of a trade union —unionized adjective —unionization /ˌjuːnjənaɪˈzeɪʃən $ -jənə-/ noun [uncountable]→ See Verb table
Examples from the Corpus
unionize• Fifty years ago, governments were not unionized.• In the private sector, only 15 percent is unionized.• Osborne believes the only way to give physicians a say in how their patients are cared for is to unionize.• About 10 percent of the private sector and 37 percent in the public sector are unionized, according to the AFL-CIO.• Most of their work force is unionized, as is the shipping industry, which is in Oakland and not San Francisco.• He said that unionized or civil-service workers have protection about what can go in their files.• In 1995, unionized Safeway employees struck for nine days before reaching a contract settlement.From Longman Business Dictionaryunionizeu‧nion‧ize /ˈjuːnjənaɪz/ (also unionise British English) verb [intransitive, transitive]HUMAN RESOURCES if workers unionize or are unionized, they become members of a TRADE UNIONMore than 50% of the labour force is unionized.unionized workers→ See Verb table 