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• pro rata
  pro rata

  adverb

  in proportion; according to a certain rate.
• pro-rata
  pro-rata

  adjective

  proportionately determined.

pro rata

¹ American  

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

adverb

1. in proportion; according to a certain rate.

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pro-rata ² American  

[proh-rey-tuh, -rah-] / proʊˈreɪ tə, -ˈrɑ- /

adjective

1. proportionately determined.

   a pro-rata share of income.

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pro rata British  

/ ˈprəʊ ˈrɑːtə /

1. in proportion

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Etymology

Origin of pro rata

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

Example Sentences

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

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

“For every dollar a team spent over that threshold, Activision would fine the team one dollar and distribute the collected sum pro rata to all non-offending teams in the league.”

From Los Angeles Times • Apr. 3, 2023

As a temporary expedient—to keep the bank sufficiently under cover and still allow Boyne the publicity he needs—replace this money pro rata among yourselves.

From The Million-Dollar Suitcase by MacGowan, Alice