Etymology
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warrant (n.)

c. 1200, "protector, defender," from Old North French warant "defender; surety, pledge; justifying evidence" (Old French garant), from Frankish *warand, from Proto-Germanic *war- "to warn, guard, protect" (source also of Old High German werento "guarantor," noun use of present participle of weren "to authorize, warrant;" German gewähren "to grant"), from PIE root *wer- (4) "to cover."

Sense evolved via notion of "permission from a superior which protects one from blame or responsibility" (early 14c.) to "document conveying authority" (1510s). A warrant officer in the military is one who holds office by warrant (as from a government department), rather than by commission (from a head of state).

warrant (v.)

late 13c., "to keep safe from danger," from Old North French warantir "safeguard, protect; guarantee, pledge" (Old French garantir), from warant (see warrant (n.)). Meaning "to guarantee to be of quality" is attested from late 14c.; sense of "to guarantee as true" is recorded from c. 1300. Related: Warranted; warranting; warrantable.

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Definitions of warrant
1
warrant (n.)
a writ from a court commanding police to perform specified acts;
warrant (n.)
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
Synonyms: stock warrant / stock-purchase warrant
warrant (n.)
formal and explicit approval;
warrant (n.)
a written assurance that some product or service will be provided or will meet certain specifications;
2
warrant (v.)
provide adequate grounds to justify (a certain course of action);
The emergency does not warrant all of us buying guns
warrant (v.)
stand behind and guarantee the quality, accuracy, or condition of;
The dealer warrants all the cars he sells
I warrant this information
Synonyms: guarantee
From wordnet.princeton.edu