[proh-reyt, proh-reyt]
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.

1855–60, Americanism; partial translation of pro rata

proratable, adjective
proration, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prorate (prəʊˈreɪt, ˈprəʊreɪt)
chiefly (US), (Canadian) to divide, assess, or distribute (something) proportionately
[C19: from pro rata]

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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American Heritage
Cultural Dictionary

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 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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Example sentences
The companies would also have to prorate any cancellation fees.
Use general procedures for life expectancy cases to prorate and offset.
If you owned or rented only part of the year, you must prorate your credit.
Prorate premiums for vehicles not used exclusively by the transportation
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