tes·ti·fy [ téstə f ](past and past participletes·ti·fied, present participletes·ti·fy·ing, 3rd person present singulartes·ti·fies)
intransitive verb
Definition:
1. make declaration under oath in court: to declare something that can be taken as evidence under oath in a court of law
2. affirm something from experience: to make a factual statement based on personal experience, or declare something to be true from personal experience
3. prove or demonstrate: to be clear evidence of something
(
formal
)
4. christianity talk about experience as Christian: to talk to an audience or group of listeners about personal experience as a Christian
[14th century. < Latin testificari "make yourself a witness" < testis "witness"]