collateral order doctrine
C2CEFR level
92/100Rarity: very rare
TechnicalRegister
The rule permitting immediate appeal of a discrete ruling that conclusively determines an important issue separate from the merits.
The denial of immunity was appealable at once under the collateral order doctrine.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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