| verb | provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes “His high fever attested to his illness” |
| verb | guarantee payment on; of checks |
| verb | authorize officially “I am licensed to practice law in this state” |
| verb | guarantee as meeting a certain standard “certified grade AAA meat” |
| verb | declare legally insane |
| adjective | endorsed authoritatively as having met certain requirements “a certified public accountant” |
| adjective | fit to be certified as insane (and treated accordingly) |
| adjective | holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill “a registered pharmacist” |
| attestation | noun | the evidence by which something is attested |
| certification | noun | confirmation that some fact or statement is true through the use of documentary evidence |
| manifestation | noun | expression without words |
| demonstrative | adjective | serving to demonstrate |
| evidence | noun | an indication that makes something evident |
| certificate | noun | a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends |
| license | noun | the act of giving a formal (usually written) authorization |
| licensee | noun | someone to whom a license is granted |
| licenser | noun | an official who can issue a license or give authoritative permission (especially one who licenses publications) |
| licence | noun | freedom to deviate deliberately from normally applicable rules or practices (especially in behavior or speech) |
| certificatory | adjective | serving to certify or endorse authoritatively |
| certifiable | adjective | capable of being guaranteed or certified |
| endorsement | noun | formal and explicit approval |
| indorsement | noun | formal and explicit approval |
| certify | verb | declare legally insane |