Definitions

1. adjective

able to resist or withstand proof, especially a liquor that will not be affected by proof, a standard measure of the strength of spirits.

“This aboveproof whiskey is a popular choice among connoisseurs.”

2. noun

a standard measure of the strength of spirits, typically 57.1% ABV.

“The label on the bottle indicated the whiskey was 40 proof, which is the standard in most countries.”