reckoner Meaning, Definition & Usage
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noun an expert at calculation (or at operating calculating machines)
calculator; estimator; computer; figurer.
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noun a handbook of tables used to facilitate computation
ready reckoner.
WordNet
Reck"on*er noun
Definitions
One who reckons or computes; also, a book of calculation, tables, etc., to assist in reckoning. Reckoners without their host must reckon twice. Camden.