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pəˈrɛm(p)t(ə)ri, 
ˈpɛrɪm-/
adj.
  - insisting on immediate attention or obedience; brusque and imperious.
- Law  not open to appeal or challenge; final.
Derivative
- peremptorily adv.
- peremptoriness n.
Etymology
ME: via Anglo-Norman Fr. from L. peremptorius ‘deadly, decisive’, from perempt-, perimere ‘destroy, cut off’.