Meaning of the word "pro rata" in English

What does "pro rata" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

pro rata

US /ˌproʊ ˈreɪ.t̬ə/
UK /ˌprəʊ ˈrɑː.tə/

Adverb

in proportion; proportionally

Example:
The bonus will be paid pro rata based on the number of months worked.
Part-time employees receive benefits pro rata.

Adjective

calculated proportionally

Example:
The annual fee is subject to a pro rata adjustment if you join mid-year.
They offered a pro rata refund for the unused portion of the service.