1. people who support or advocate for labor unions
2. people who support the political union of territories or states
Usage: political

Examples

• The unionists organized a rally to support workers’ rights.
• Many unionists opposed the company’s plan to cut benefits.
• The factory employed several active unionists who negotiated with management.
• Northern Ireland unionists want to maintain ties with Britain.
• The unionists campaigned against independence in the referendum.
• Local unionists gathered signatures for better working conditions.
• Political unionists argued for keeping the territories together.