The Collaborative International Dictionary
Avowance
Avowance \A*vow"ance\, n.
Act of avowing; avowal.
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Upholding; defense; vindication. [Obs.]
Can my avowance of king-murdering be collected from anything here written by me?
--Fuller.
Wiktionary
avowance
n. 1 (context obsolete English) Act of avowing; avowal. 2 (context obsolete English) upholding; defence; vindication