Main Entry: tes·ti·fy

Pronunciation: \ˈtes-tə-ˌfī\

Function: verb

Inflected Form(s): tes·ti·fied; tes·ti·fy·ing

Etymology: Middle English testifien, from Anglo-French testifier, from Latin testificari, from testis witness

Date: 14th century

intransitive verb 1 a : to make a statement based on personal knowledge or belief : bear witness b : to serve as evidence or proof
2 : to express a personal conviction
3 : to make a solemn declaration under oath for the purpose of establishing a fact (as in a court)transitive verb 1 a : to bear witness to : attest b : to serve as evidence of : prove
2 archaic a : to make known (a personal conviction) b : to give evidence of : show
3 : to declare under oath before a tribunal or officially constituted public body

— tes·ti·fi·er \-ˌfī(-ə)r\ noun