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Synonyms

pro rata

1 American  
[proh rey-tuh, rah-] / proʊ ˈreɪ tə, ˈrɑ- /

adverb

  1. in proportion; according to a certain rate.

pro-rata 2 American  
[proh-rey-tuh, -rah-] / proʊˈreɪ tə, -ˈrɑ- /

adjective

  1. proportionately determined.

    a pro-rata share of income.
pro rata British  
/ ˈprəʊ ˈrɑːtə /

  1. in proportion

"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

Etymology

Origin of pro rata

First recorded in 1565–75, pro rata is from Medieval Latin prō ratā

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

There is one wrinkle, he adds: The pro rata rule.

From MarketWatch • Apr. 9, 2026

Burdis says it is possible that redemption requests at some might exceed the threshold of 5% of assets, after which Blue Owl is allowed to only honor them partially, in a pro rata fashion.

From Barron's • Dec. 10, 2025

The insurers are assessed pro rata based on their market share.

From Los Angeles Times • Feb. 11, 2025

In that case, you’d only owe pro rata rent through the date when you vacate the unit and a landlord couldn’t charge you any fines or fees for terminating the lease.

From Seattle Times • Feb. 20, 2024

It should be distributed pro rata among all my creditors.”

From The Works of Robert Louis Stevenson - Swanston Edition Vol. 4 (of 25) by Stevenson, Robert Louis

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.