Stipulative definition

Stipulative definition is when someone makes up a new definition for a word or a phrase to use in a specific situation. It's like if you were playing a game and you said "In this game, the word 'banana' means you have to hop on one leg." That's a stipulative definition because it's not what 'banana' usually means. Stipulative definitions can be helpful when people need to use special words or phrases that everyone understands in the same way, but sometimes they can cause confusion if people don't know what the new definition is.