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reckoner Meaning, Definition & Usage

  1. noun an expert at calculation (or at operating calculating machines)
    calculator; estimator; computer; figurer.
  2. noun a handbook of tables used to facilitate computation
    ready reckoner.
WordNet

Reck"on*er noun
Definitions
  1. One who reckons or computes; also, a book of calculation, tables, etc., to assist in reckoning.
    Reckoners without their host must reckon twice. Camden.

Webster 1913