/ Dictionary / Index A Altadena: Meaning and Definition of Find definitions for: Al•ta•de•na Pronunciation: (al"tu-dē'nu), [key] — n. a town in SW California, near Los Angeles. 40,510. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Alta. Altai Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language