A settling of accounts or final reckoning that takes place after some time has passed, or a second calculation made to verify the first.
Compound of 'after' and 'reckoning' (Old English recening, from Germanic roots). Medieval merchants used this term for final accounting procedures.
The existence of afterreckoning in medieval accounting shows that people understood the value of double-checking their work long before computers—scribes would literally do math twice to catch errors.
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