Definition of: testify

(tes′tə·fī) v. ·fied, ·fy·ing v.i.
1. To make solemn declaration of truth or fact.
2. Law To give testimony; bear witness.
3. To serve as evidence or indication: Her rags testified to her poverty.
—v.t.
4. To bear witness to; affirm positively.
5. Law To state or declare on oath or affirmation.
6. To be evidence or indication of.
7. To make known publicly; declare. See synonyms under AFFIRM, AVOW. [<L testificari <testis witness + facere make]
—tes′ti·fi′er noun