1. (v. i.) 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.

2. (v. i.) 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.

3. (v. i.) To declare a charge; to protest; to give information; to bear witness; -- with against.

4. (v. t.) To bear witness to; to support the truth of by testimony; to affirm or declare solemnly.

5. (v. t.) To affirm or declare under oath or affirmation before a tribunal, in order to prove some fact.

6. (adv.) In a testy manner; fretfully; peevishly; with petulance.

acknowledge affirm allege announce argue assert assert under oath asseverate assure attest aver avouch avow be indicative of be significant of be symptomatic of bear witness bespeak betoken book bring forward call to witness certify characterize connote declare demonstrate denominate denote depone depose differentiate disclose display entail express give evidence give token guarantee highlight hint identify indicate involve kiss the book manifest mark mean mount note point to proclaim prove reveal say show signify stand for state suggest swear swear by bell swear in swear the truth swear to swear to God swear to goodness symptomatize symptomize take oath vouch vouchsafe vow warrant witness