/ pəˈremptəri; NAmE / adjective
( formal , disapproving ) ( especially of sb's manner or behaviour ) expecting to be obeyed immediately and without question or refusal :
a peremptory summons
The letter was peremptory in tone.
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WORD ORIGIN
late Middle English (as a legal term): via Anglo-Norman French from Latin peremptorius deadly, decisive, from perempt- destroyed, cut off, from the verb perimere , from per- completely + emere take, buy.