Definitions

1. verb

to give evidence or a statement, especially under oath, about something that you have seen or know

“The witness was called to testify about the accident.”

2. noun

the act or process of giving evidence or a statement, especially under oath

“Her testimony was crucial in the trial.”

3. noun

a person who gives evidence or a statement, especially under oath

“The expert witness will testify to the safety of the product.”