Source : Webster's Revised Unabridged Dictionary (1913)

Peremptory \Per"emp*to*ry\, a. [L. peremptorius destructive,
   deadly, decisive, final: cf. F. p['e]remptorie. See
   {Perempt}.]
   1. Precluding debate or expostulation; not admitting of
      question or appeal; positive; absolute; decisive;
      conclusive; final.

            Think of heaven with hearty purposes and peremptory
            designs to get thither.               --Jer. Taylor.

   2. Positive in opinion or judgment; decided; dictatorial;
      dogmatical.

            Be not too positive and peremptory.   --Bacon.

            Briefly, then, for we are peremptory. --Shak.

   3. Firmly determined; unawed. [Poetic] --Shak.

   {Peremptory challenge} (Law) See under {Challenge}.

   {Peremptory mandamus}, a final and absolute mandamus.

   {Peremptory plea}, a plea by a defendant tending to impeach
      the plaintiff's right of action; a plea in bar.

   Syn: Decisive; positive; absolute; authoritative; express;
        arbitrary; dogmatical.