A misspelling or variant of 'equivalent,' meaning equal in value, amount, or significance.
This appears to be a non-standard or archaic spelling of 'equivalent,' which comes from Latin 'aequivalent-' (equal in value).
This spelling is so rare that most dictionaries don't list it separately—it's a reminder that spelling has changed dramatically over time, and what looks 'wrong' today might have been perfectly normal in Middle English!
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