/ Dictionary / Index T trade unionism: Meaning and Definition of Find definitions for: trade' un'ionism Pronunciation: [key] the system, methods, or practice of trade or labor unions. trade unions collectively. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trade union trade unionist Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language