/ Dictionary / Index L labor union: Meaning and Definition of Find definitions for: la'bor un"ion Pronunciation: [key] an organization of wage earners or salaried employees for mutual aid and protection and for dealing collectively with employers; trade union. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. labor spy labor unionist Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language