pro rata

pro rata

[proh rey-tuh, rah-]
noun
in proportion; according to a certain rate.

Origin:
1565–75; < Medieval Latin prō ratā

Dictionary.com Unabridged

pro-rata

[proh-rey-tuh, -rah-]
adjective
proportionately determined: a pro-rata share of income.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pro rata (ˈprəʊ ˈrɑːtə)
 
in proportion
 
[Medieval Latin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

pro rata
1575, from L. pro rata (parte) "according to the calculated (share)," from pro "for" + rata, abl. sing. of ratus, pp. of reri "to count, reckon" (see rate).
Online Etymology Dictionary, © 2010 Douglas Harper
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