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reckoner

[rek-uh-ner] /ˈrɛk ə nər/
noun
1.
a person who reckons.
2.
Also called ready reckoner. a collection of mathematical and other tables for ready calculation.
Origin
1175-1225
1175-1225; Middle English; see reckon, -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for reckoner

reckoner

/ˈrɛkənə/
noun
1.
any of various devices or tables used to facilitate reckoning, esp a ready reckoner
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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14
16
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