Definitions:

1. A supporter or member of a Labour Party, particularly in the UK, Australia, or other countries with a Labour political movement. NOUN
   • The seasoned Labourite politician delivered a rousing speech at a local meeting.
2. Someone who supports left-wing or socialist policies associated with labour rights and social democracy. NOUN
   • As a lifelong labourite, she strongly advocates for workers' rights and sical welfare programs.

Synonyms:

• labour supporter
• leftist
• progressive
• social democrat
• trade unionist