/ Dictionary / Index S signior: Meaning and Definition of Find definitions for: si•gnior Pronunciation: (sēn'yôr, -yōr, sin-yôr', -yōr'), [key] — n. signor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: signior (Thesaurus) sign-in sign language Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language