/ Dictionary / Index T third man: Meaning and Definition of Find definitions for: third' man' Pronunciation: [key] the position of a fielder on the off side between slip and point. the fielder occupying this position. the position of a player, first in the line of defense between center and goal. the player occupying this position. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. third law of thermodynamics third mate Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language