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.

To make a solemn declaration under oath or affirmation,
for the purpose of establishing, or making proof of, some fact to a
court; to give testimony in a cause depending before a tribunal.

To declare a charge; to protest; to give information;
to bear witness; – with against.

To bear witness to; to support the truth of by
testimony; to affirm or declare solemny.

To affirm or declare under oath or affirmation before a
tribunal, in order to prove some fact.