/ Dictionary / Index D defensible: Meaning and Definition of Find definitions for: de•fen•si•ble Pronunciation: (di-fen'su-bul), [key] — adj. capable of being defended against assault or injury: The troops were bivouacked in a defensible position. that can be defended in argument; justifiable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: defensible (Thesaurus) defense mechanism defensive Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language