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peremptory (adj.)

"decisive," mid-15c., legal term, from Anglo-French peremptorie, from Latin peremptorius "destructive, decisive, final," from peremptor "destroyer," from perimpere "destroy, cut off," from per "away entirely, to destruction" (see per) + emere "to take" (from PIE root *em- "to take, distribute"). Of persons or their words, "certain, assured, brooking no debate," 1580s. Related: Peremptorily.