/ Dictionary / Index A Alfonso X: Meaning and Definition of Find definitions for: Al•fon•so X Pronunciation: (al-fon'sō, -zō Sp. äl-fôn'sô), [key] — (“Alfonso the Wise”) 1221–84, king of Castile 1252–84. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Alfonso I Alfonso XII Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language