Bearing or expressing equal value or worth; having the quality of being equivalent.
A variant or archaic form combining 'aequus' (equal) and '-valiant' or similar suffix construction, though this form is rarely used in modern English, existing primarily in historical technical or legal documents.
This word is so obscure that even most spell-check programs don't recognize it, yet it occasionally appears in 400-year-old legal documents, showing how English constantly sheds words that become 'too long' or 'too fussy.'
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