TESTIFY

verb (-fied; -fying) Etymology: Middle English testifien, from Anglo-French testifier, from Latin testificari, from testis witness Date: 14th century intransitive verb 1. to make a statement based on personal knowledge or belief ; bear witness, to serve as evidence or proof, to express a personal conviction, to make a solemn declaration under oath for the purpose of establishing a fact (as in a court), transitive verb 1. to bear witness to ; attest , to serve as evidence of ; prove , 2. archaic to make known (a personal conviction), to give evidence of ; show , to declare under oath before a tribunal or officially constituted public body, testifier noun