/ Dictionary / Index C chieftain: Meaning and Definition of Find definitions for: chief•tain Pronunciation: (chēf'tun, -tin), [key] — n. the chief of a clan or a tribe. a leader of a group, band, etc.: the robbers' chieftain. (cap.)Britain's main battle tank since 1969, fitted with a 120mm gun and two machine guns and weighing 55 tons (50 m tons). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: chieftain (Thesaurus) chief petty officer chief warrant officer Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language