Reckoner

//ˈɹɛkənə(ɹ)// noun

Definitions

Noun
  1. 1
    One who reckons.

    "“No. Not quite a month.—It is only four weeks to-morrow since I left Mansfield.” “You are a most accurate and honest reckoner. I should call that a month.”"

  2. 2
    a handbook of tables used to facilitate computation wordnet
  3. 3
    An accountant; one who computes or calculates. archaic
  4. 4
    an expert at calculation (or at operating calculating machines) wordnet
  5. 5
    An ordinator.

Etymology

From Middle English reknere, rekenere. Cognate with Afrikaans rekenaar, Dutch Low Saxon rekener, German Rechner, Danish regner, Swedish räknare. By surface analysis, reckon + -er.

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