Peremptory means giving an order that allows no argument. A peremptory tone, a peremptory summons, peremptorily dismissed.
It is about manner as much as authority, since a peremptory instruction closes the matter by how it is said. In law a peremptory challenge lets a party reject a juror without giving any reason.
1adjectiveperemptoryGiving an order that allows no argument.
“'Sit down,' she said in a peremptory tone, and nobody dared to argue.”
peremptory is a quality.
Latin peremptorius means decisive, from perimere, to destroy or cut off.
Latin
peremptōrius — deadly; precluding debate, decisive
Anglo-Norman
peremptorie
English, today
peremptory
Built from
From Anglo-Norman peremptorie, parentorie et al. (Modern French péremptoire), and its source, Latin peremptōrius (“deadly; precluding debate, decisive”), from perimō (“destroy, thwart”), from per- (“thorough”) + emō (“to obtain, buy”).
Etymology from Wiktionary, CC BY-SA