warrant

Sense 1 noun

a writ from a court commanding police to perform specified acts

Sense 2 verb

show to be reasonable or provide adequate ground for

The emergency does not warrant all of us buying guns

Sense 3 noun

a type of security issued by a corporation (usually together with a bond or preferred stock) that gives the holder the right to purchase a certain amount of common stock at a stated price

as a sweetener they offered warrants along with the fixed-income securities

Sense 4 verb

stand behind and guarantee the quality, accuracy, or condition of

The dealer warrants all the cars he sells

Sense 5 noun

formal and explicit approval

a Democrat usually gets the union's endorsement

Sense 6 noun

a written assurance that some product or service will be provided or will meet certain specifications