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Abettor

//əˈbɛtə// noun

Noun

1
One that abets an offender; one that incites; instigates; encourages.
"Thou foul abettor! thou notorious bawd! Thou plantest scandal and displacest laud:"
2
one who helps or encourages or incites another wordnet
3
A supporter or advocate.
"[…] when he recollected that, being there as an assistant, he actually seemed—no matter what unhappy train of circumstances had brought him to that pass—to be the aider and abettor of a system which filled him with honest disgust and indignation, he loathed himself […]"

From Middle English abettour, from Anglo-Norman abettour, from Old French abeter + -our (“-or”). See abet.

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