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pro rata

[proh rey-tuh, rah-] /proʊ ˈreɪ tə, ˈrɑ-/
noun
1.
in proportion; according to a certain rate.
Origin
1565-1575
1565-75; < Medieval Latin prō ratā

pro-rata

[proh-rey-tuh, -rah-] /proʊˈreɪ tə, -ˈrɑ-/
adjective
1.
proportionately determined:
a pro-rata share of income.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pro rata

pro rata

/ˈprəʊ ˈrɑːtə/
uknown
1.
in proportion
Word Origin
Medieval Latin
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 pro rata

1570s, from Latin pro rata (parte) "according to the calculated (share)," from pro "for" (see pro-) + rata, ablative singular of ratus, past participle of reri "to count, reckon" (see rate (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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