Appropriate or suitable for a particular purpose or situation; proper or right for the circumstances.
From the verb 'fit,' which comes from Old English 'fitt' or 'fitte,' possibly related to Norse 'fitja' (to fit together). The '-ing' suffix makes it an adjective describing suitability.
A truly fitting punishment or reward feels satisfying to humans in an almost primal way—we're hardwired to seek 'poetic justice,' which might explain why revenge fantasies feel so good but executing them usually backfires.
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