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calculator (n.)

late 14c., "mathematician, one who calculates," from Latin calculator, from calculatus, past participle of calculare "to reckon, compute," from calculus "reckoning, account" (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]

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Definitions of calculator from WordNet

calculator (n.)
an expert at calculation (or at operating calculating machines);
Synonyms: reckoner / figurer / estimator / computer
calculator (n.)
a small machine that is used for mathematical calculations; can be mechanical or electronic;
Synonyms: calculating machine
From wordnet.princeton.edu