TEST'IFY, v.i. [L. testificor; testis and facio.]

1. To make a solemn declaration, verbal or written, to establish some fact; to give testimony for the purpose of communicating to others a knowledge of something not known to them.

Jesus needed not that any should testify of man, for he knew what was in man. John 2.

2. In judicial proceedings, to make a solemn declaration under oath, for the purpose of establishing or making proof of some act to a court; to give testimony in a cause depending before a tribunal.

One witness shall not testify against any person to cause him to die. Num.35.

3. To declare a charge against one.

O Israel, I will testify against thee. Ps.1.

4. To protest; to declare against.

I testified against them in the day wherein they sold victuals. Neh.13.

TEST'IFY, v.t. To affirm or declare solemnly for the purpose of establishing a fact.

We speak that we do know, and testify that we have seen. John 3.

1. In law, to affirm or declare under oath before tribunal, for the purpose of proving some fact.

2. To bear witness to; to support the truth of by testimony.

To testify the gospel of the grace of God. Acts.20.

3. To publish and declare freely.

Testifying both to the Jews, and also to the Greeks, repentance towards God and faith towards our Lord Jesus Christ. Acts.20.