/ Dictionary / Index A ad extremum*: Meaning and Definition of Find definitions for: ad ex•tre•mum Pronunciation: (äd ek-strā'moom Eng. ad ek-strē'm&schwam), [key] — Latin. Latin. to the extreme; at last; finally. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. à deux ADF 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