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Synonyms

reckoner

American  
[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.

reckoner British  
/ 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

Etymology

Origin of reckoner

Middle English word dating back to 1175–1225; see origin at reckon, -er 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Alongside a new "ready reckoner" tool, allowing farms to calculate how much they might be offered, Irranca-Davies announced £33m for nine preparatory schemes to " back farm businesses during the transition to the new SFS".

From BBC • Jul. 20, 2025

There is even a random-text-generating word-frame called the Engine, reminiscent of Gottfried Leibniz's late-seventeenth-century calculating machine, the step reckoner.

From Nature • Sep. 26, 2017

Man, now having to calculate the various allocations of "leisure," has become, in the realm of consumption, Homo oeconomicus and reckoner of time.

From Time Magazine Archive

But the sand reckoner was destined to meet his fate while reckoning in the sand.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

That's ranching in a kind of outline which sort of reduces it to a question of figures which it wouldn't need a trick reckoner to work out.

From The Son of his Father by Cullum, Ridgwell

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.