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[proh-reyt, proh-reyt] /proʊˈreɪt, ˈproʊˌreɪt/
verb (used without object), prorated, prorating.
to make an arrangement on a basis of proportional distribution.
verb (used with object), prorated, prorating.
to divide, distribute, or calculate proportionately.
Origin of prorate
1855-60, Americanism; partial translation of pro rata
Related forms
proratable, adjective
proration, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for prorate


/prəʊˈreɪt; ˈprəʊreɪt/
(mainly US & Canadian) to divide, assess, or distribute (something) proportionately
Derived Forms
proratable, adjective
proration, noun
Word Origin
C19: from pro rata
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
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Word Origin and History for prorate

also pro-rate, "divide proportionally," 1860, American English, verb derived from Latin pro rata (parte) (see pro rata). Related: Prorated; prorating.

Online Etymology Dictionary, © 2010 Douglas Harper
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prorate in Culture

prorate definition

To divide or distribute a sum of money proportionately. For example, if one owned an automobile for only three months, an insurance company would prorate the annual premium by charging only one-quarter of it.

The 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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