/ Dictionary / Index U undersigned: Meaning and Definition of Find definitions for: un•der•signed Pronunciation: (adj.un"dur-sīnd', un'dur-sīnd"n.un'dur-sīnd"), [key] — adj. being the one or ones whose signature appears at the end of a letter or document: All of the undersigned persons are bound by the contract. signed at the bottom or end of, as a writing: The undersigned names guarantee the good faith of the statement. —n. the person or persons signing a letter or document. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: undersigned (Thesaurus) undersign undersize Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language