The word "signatured" refers to the act of signing one's name as a mark of approval or endorsement. Some synonyms for this word include autographed, signed, endorsed, approved, stamped, marked, and authenticated. Autographed emphasizes the personal touch of signing, while stamped and marked suggest official approval. Endorsed and approved both convey the idea of supporting or recommending something. Authenticated goes further to indicate that the signature has been validated as genuine. Regardless of the synonym chosen, all convey the important idea that something has been signed as a formal confirmation of its validity or approval.