/ Dictionary / Index S San Ildefonso: Meaning and Definition of Find definitions for: San Il•de•fon•so Pronunciation: (sän ēl"de-fôn'sô), [key] a town in central Spain, near Segovia: termed the “Spanish Versailles” for its 18th-century palacetreaty 1800. 4164. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sanies sanious Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language