peremptoryyoudaoicibaDictYouDict
peremptory: [16] Peremptory comes via Anglo- Norman peremptorie from Latin peremptōrius. This meant ‘destructive’, and was derived from perimere ‘take away completely’, a compound verb formed from the prefix per- ‘completely’ and emere ‘obtain’ (source of English example, exempt, prompt, etc). By extension it was used for ‘taking away all possibility of debate’, and hence ‘decisive’.
=> example, exempt, prompt
peremptory (adj.)youdaoicibaDictYouDict
"decisive," mid-15c., legal term, from Anglo-French peremptorie, from Middle French peremtoire, 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" (see exempt (adj.)). Of persons or their words, "certain, assured, brooking no debate," 1580s. Related: Peremptorily.