[proh-rey-tuh, -rah-]


proportionately determined: a pro-rata share of income.

pro rata

[proh rey-tuh, rah-]


in proportion; according to a certain rate.

Origin of pro rata

First recorded in 1565–75, pro rata is from the Medieval Latin word prō ratā Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pro-rata

Historical Examples of pro-rata

British Dictionary definitions for pro-rata

pro rata

in proportion

Word Origin for pro rata

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

Word Origin and History for pro-rata

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