An archaic or variant form referring to someone who counts or calculates, or possibly an early spelling of 'counter.'
From the Old French 'compteur,' an agent noun from 'compter' (to count). This represents an older English spelling before standardization settled on 'counter.'
Before computers, 'compters' were actual people—accountants, cashiers, and clerks whose entire job was to count, calculate, and keep records, making them among history's first human 'calculating machines.'
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