a solemn statement made under oath
"The witness gave his testimony, swearing that he saw the suspect flee the scene."
an assertion offering firsthand authentication of a fact
"according to his own testimony he can't do it"
Statements made by a witness in court.
"The jury listened carefully to his testimony regarding what he saw on the night of the robbery."
In plain English: Testimony is when someone gives their personal account of what they saw or heard to prove something is true.
"The judge accepted the witness's testimony without hesitation."
The word testimony traveled into English through the path of Middle English and Old French. It ultimately comes from a Latin root meaning "witness" or "proof."