The Vocalibrate dictionary

aver

US/əˈvɝ/GB/əˈvɜː/verb

to state firmly that something is true

The witness averred that she had never met the accused.

Near in meaning: assertdeclareaffirmmaintain
In the family: averment

More words worth knowing

mireto trap in a difficult situation that is hard to escape mollifyto calm someone's anger or soothe their feelings piqueto stir up interest or curiosity begetto cause or bring about eschewto deliberately avoid or keep away from whetto sharpen or stir up a desire or interest