a person who calculates or computes.
Also called calculating machine. a small electronic or mechanical device that performs calculations, requiring manual action for each individual opertion.
a person who operates such a machine.
a set of tables that facilitates calculation.

1375–1425; late Middle English < Latin; see calculate, -tor

minicalculator, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
calculator (ˈkælkjʊˌleɪtə)
1.  a device for performing mathematical calculations, esp an electronic device that can be held in the hand
2.  a person or thing that calculates
3.  a set of tables used as an aid to calculations

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "mathematician, one who calculates," from L. calculator, from calculatus, pp. of calculare "to reckon, compute," from calculus (see calculus). Of mechanical adding machine contraptions, from 1784. Of electronic ones, from 1946.
"Electronic calculator uses 18,000 tubes to solve complex problems" ["Scientific American" headline, June 1946]
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

calculator definition

An electronic device for performing automatic mathematical computations, usually controlled by a keyboard. Some are actually small computers, with limited memory, that allow the user to use simple programs.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

calculator definition

bitty box

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Often he had his calculator on the side, adding and weighting and subtracting
  and compiling.
And they will not be able to even total the fast food purchase with a
Indeed, aside from the pocket calculator, the introduction of new products has
  fallen off drastically in the last ten years.
The word originally meant an individual who solved equations, often using a
  mechanical calculator.
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