avow

To declare openly and boldly, as something believed to be right; to own, acknowledge or confess frankly.

[…] in 1786, and for some period later, there were few, if any, prominent Americans, who avowed themselves in favor of broadly democratic systems.

To bind or devote by a vow.

No man may halewe and avowe the firste gendrid thingis that perteynen to the Lord, whether it is oxe, whether scheep, tho ben the Lordis part.

To acknowledge and justify, as an act done. See avowry.

avow himself the accomplice of his crimes

avowal

without thy Knowledge and Avow