WordWeb Online

1. Not converted into ions
   - nonionized, nonionised [Brit], unionised [Brit], nonionic
    
2. Being a member of or formed into a labour union
   "unionized workers"; "a unionized shop";
   - organized, organised [Brit], unionised [Brit]

1. 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";
   - unionise [Brit]
    
2. Form or join a union
   "The auto workers decided to unionize";
   - unionise [Brit], organize, organise [Brit]

See also: union

Type of: enrol [Brit, Cdn], enroll [N. Amer], enter, fall in, get together, inscribe, join, recruit

Encyclopedia: Unionized