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Noun: reckoner  re-ku-nu(r)
  1. An expert at calculation (or at operating calculating machines)
    "The company hired a reckoner to manage their complex financial projections";
    - calculator, figurer, estimator, computer
     
  2. A handbook of tables used to facilitate computation
    "The carpenter used a ready reckoner to quickly estimate material costs";
    - ready reckoner [Brit]

Derived forms: reckoners

Type of: enchiridion, expert, handbook, vade mecum

Encyclopedia: Reckoner