/ Dictionary / Index I in extenso*: Meaning and Definition of Find definitions for: in ex•ten•so Pronunciation: (in eks-ten'sō Eng. in ik-sten'sō), [key] — Latin. Latin. at full length. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. inextensible inextinguishable Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language