reckoner

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reck·on·er

 (rĕk′ə-nər)
n.
A handbook of mathematical tables used to facilitate computation.

reckoner

(ˈrɛkənə)
n
(Mathematics) any of various devices or tables used to facilitate reckoning, esp a ready reckoner

Reckoner

A small book of assorted tables that was mainly used by store owners who did not want to take the time to do the necessary arithmetic, or by those who did not know how to do the calculations. Included were tables such as interest amount vs. time and rate, board dimensions vs. board feet, and cistern capacity vs. cistern dimensions.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Reckoner - an expert at calculation (or at operating calculating machines)reckoner - an expert at calculation (or at operating calculating machines)
expert - a person with special knowledge or ability who performs skillfully
adder - a person who adds numbers
number cruncher - someone able to perform complex and lengthy calculations
actuary, statistician - someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums)
subtracter - a person who subtracts numbers
2.reckoner - a handbook of tables used to facilitate computation
enchiridion, handbook, vade mecum - a concise reference book providing specific information about a subject or location
Translations
References in classic literature ?
But let the wise be warned against too great readiness at explanation: it multiplies the sources of mistake, lengthening the sum for reckoners sure to go wrong.
"You are a most accurate and honest reckoner. I should call that a month."
Cassandra Leungs parents breed and train Reckoners, genetically engineered sea monsters that grow to the size of the ships they are bonded to in order to protect them from pirates.