res judicata
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
A matter already conclusively decided that cannot be relitigated between the same parties.
Their second suit foundered on res judicata: the identical claim had been dismissed on the merits in 2019.
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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