Annual percentage rate.
"The lender refused to approve our mortgage because the APR was too high compared to other offers we received."
In plain English: An APR is the yearly interest rate you pay on money you borrow, expressed as a percentage.
"The company has an apr on all purchases made during the sale."
Usage: Do not use APR as a standalone noun; it must always be preceded by its full form, annual percentage rate, or explicitly defined within your sentence to avoid confusion with other abbreviations like A.P.R. (A.P.R. can also mean "apostolic prayer" in religious texts).
Abbreviation of April.
"I'll meet you at the park on apr 15th for our spring picnic."
There is no English word spelled "apr"; you likely mean apron, which comes from Old French aperon (a covering) and originally referred to a protective garment worn by workers. Alternatively, if referring to the month abbreviation, it derives directly from Latin Aprilis, named after the goddess Aprilis or linked to the verb aperire meaning "to open.