Word Origin & History
early 13c., "protector, defender," from O.N.Fr. warant (O.Fr. guarant), from Frankish *warand (cf. O.H.G. weren "to authorize, warrant," Ger. gewähren "to grant"), from P.Gmc. *war- "to warn, guard, protect," perhaps from PIE base *wer- "to cover" (cf. L. vereri "to observe with awe, revere, respect,
fear;" Gk. ouros "watchman," horan "to see;" Hitt. werite- "to see;" see weir
). Sense evolved via notion of "permission from a superior which protects one from blame or responsibility" (c.1300) to "document conveying authority" (1510s). A warrant office in the military is one who holds office by warrant, rather than by commission.
1577, from un-
(1) "not" + pp. of warrant
late 13c., "to keep safe from danger," from O.N.Fr. warantir (O.Fr. guarantir), 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.