/ Dictionary / Index S say-so: Meaning and Definition of Find definitions for: say-so Pronunciation: (sā'sō"), [key] — pl. say-sos. one's personal statement or assertion. final authority; directing influence. an authoritative statement. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: say-so (Thesaurus) Say's law Sayville Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language