The act or instance of abetting; help or encouragement given to someone to commit a wrong or crime.
From abet (Old French abeter) plus the suffix -al, which forms nouns from verbs. This is a less common synonym for abetment, following a different nominalization pattern.
While abetment is the common legal term, abettal shows up in older texts and some specialized writing—it's like having two different tools in English for naming the same wrongful action!
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