1. a person who gives testimony or evidence, especially in a court of law
Usage: legal
2. a person who publicly declares or affirms their beliefs or experiences
Usage: religious

Examples

• The testifier took the stand and swore to tell the truth.
• Each testifier provided crucial evidence for the prosecution’s case.
• The defense attorney questioned the credibility of the key testifier.
• As a testifier to God’s grace, she shared her story with the congregation.
• The testifier spoke passionately about overcoming addiction.
• Several testifiers came forward to support the new policy.
• The court clerk administered the oath to each testifier.