Relating to mutual exchange or reciprocal obligation, especially in legal or contractual contexts.
From com- (together) plus mutual, suggesting shared and reciprocal arrangement. Rare in modern English but found in medieval and early modern legal documents.
This word mostly disappeared from English, but you can still see its ghost in 'mutual'—a concept that exploded in importance during the insurance boom of the 1800s with 'mutual insurance companies.'
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