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 2:25.

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. Numbers 35:30.

To declare a charge against one. O Israel, I will testify against thee. Psalm 50:7.

To protest; to declare against. I testified against them in the day wherein they sold victuals. Nehemiah 13:15.

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 3:11.

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

To bear witness to; to support the truth of by testimony. To testify the gospel of the grace of God. Acts 20:24.

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.Acis 20:21.