Webster's Revised Unabridged Dictionary · 1913

Avow

Avow ({not transcribed}) , transitive verb

[French avouver, from Latin advocare to call to (whence the meanings, to call upon as superior; recognize as lord, own, confess); ad + vocare to call. See Advocate, Avouch.]

1.
To declare openly, as something believed to be right; to own or acknowledge frankly; as, a man avows his principles or his crimes.
Which I to be the of Israel's God Avow, and challenge Dagon to the test. — Milton
2.
(Law) To acknowledge and justify, as an act done. See Avowry. — Blackstone

Avow , noun

[Compare French aveu.]

Avowal. [Obsolete] — Dryden

Avow , verb, transitive and intransitive

[Old French avouer, from Late Latin votare to vow, from Latin votun. See Vote, n.]

To bind, or to devote, by a vow. [Obsolete] — Wyclif

Avow , noun

A vow or determination. [Archaic]