1. Provide evidence for
   - testify, prove, evidence, show 
2. Give testimony in a court of law
   - testify, attest, take the stand

Derived forms: bearing witness, borne witness, bears witness, bore witness

Type of: declare, inform

• Communications Security Establishment
• communications technology
• communications theory
• communicative
• communicativeness
• communicator
• communicatory
• communion
• communion table
• communiqué
• communisation
• communise
• communism
• Communism Peak
• communist
• Communist China
• communist economy
• Communist Manifesto
• Communist Party
• Communist Party of Kampuchea
• communistic
• community
• community center
• community centre
• community chest