Warranty

Etymology

From Anglo-Norman “warantie,” a variant of Old French “garantie,” from “warant/garant” (a protector or guarantor), of Germanic origin. The Norman “w-” and the Parisian “g-” split the same word into two English doublets: “warranty” and “guarantee.”

noun · /WOR-uhn-tee/
A binding promise that a product or claim meets a stated standard, with a remedy owed if it does not.
What it names
The difference between a seller’s cheerful sales talk and a promise you can actually enforce — reach for it when deciding what a company truly owes you if something breaks.
Example
The laptop’s one-year warranty covered the dead battery, but the cracked screen was ruled accidental damage.
Related idea
A warranty is a promise about the thing itself; a waiver is the opposite move — giving up a right you would otherwise have had.