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Ready reckoner

 - 2 dictionary results

reck⋅on⋅er

[rek-uh-ner]
–noun
1. a person who reckons.
2. Also called ready reckoner. a collection of mathematical and other tables for ready calculation.

Origin:
1175–1225; ME; see reckon, -er 1
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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