'Unionist' definitions:

Definition of 'unionist'

From: WordNet
noun
A worker who belongs to a trade union [syn: trade unionist, unionist, union member]

Definition of 'Unionist'

From: GCIDE
  • Unionist \Un"ion*ist\, n.
  • 1. One who advocates or promotes union; especially a loyal supporter of a federal union, as that of the United States. [1913 Webster]
  • 2. A member or supporter of a trades union. [1913 Webster]