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Noun: reckoner  rekunu(r)
  1. An expert at calculation (or at operating calculating machines)
    - calculator, figurer, estimator, computer
     
  2. A handbook of tables used to facilitate computation
    - ready reckoner

Derived forms: reckoners

See also: reckon

Type of: enchiridion, expert, handbook, vade mecum

Encyclopedia: Reckoner