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reckoner

noun
reck·​on·​er | \ -k(ə)nə(r)\
plural -s

Definition of reckoner

1 : one that reckons
2 : an aid to reckoning especially : a book of tables

— called also ready reckoner

History and Etymology for reckoner

Middle English rikenere, from rikenen to reckon + -ere -er

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