Undersignatures refer to the signatures of individuals who are endorsing or approving a document. Some synonyms for undersignatures are endorsements, authorizations, approvals, attestations, ratifications, certifications, mandates, and consents. Endorsements are the most common synonym for undersignatures, as they are the act of publicly giving one's support or approval to something. Authorizations and approvals are synonymously similar to undersignatures, as they denote giving permission or consent. Attestations, ratifications, and certifications refer to the official validation or verification of something by a signature. Mandates and consents denote delegated authority or agreeing to something through one's signature. Overall, undersignatures are an important aspect of legal and official documentation and require careful consideration.