Open English Wordnet
Nouns
(n)warrant, stock warrant, stock-purchase warranta 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”
(n)sanction, countenance, endorsement, indorsement, warrant, imprimaturformal and explicit approval“a Democrat usually gets the union's endorsement”