Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Noun: reckoner  re-ku-nu(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

Type of: enchiridion, expert, handbook, vade mecum

Encyclopedia: Reckoner