From Late Latin peremptorius - destructive; from Latin perimere - to take entirely, destroy; from "per" - thoroughly, plus "emere" - to take.
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Wordwise: Date: 15th century.
Peremptory comes from a Latin word meaning "to take entirely" or "destroy." Something peremptory takes away entirely a person's right to make further comments or requests.
Peremptory suggests a dictatorial manner and a refusal to permit delays or objections of any kind, no matter how valid. A tough boss will call you to his office with a peremptory summons, tell you exactly what is expected of you, and then peremptorily dismiss you, perhaps with a peremptory wave of the hand.
In the courtroom, a lawyer's "peremptory challenge" is usually a refusal to accept a juror (der Geschworene) in which the lawyer isn't required to state any reason.