lacuna
C2CEFR level
80/100Rarity: very rare
TechnicalRegister
A gap or missing part, especially in an argument, text or body of knowledge.
This paper addresses a notable lacuna in the empirical literature.
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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