haecceity
C2CEFR level
97/100Rarity: very rare
TechnicalRegister
The individuating property that makes a thing uniquely this particular thing and no other.
Duns Scotus coined haecceity to name the 'thisness' distinguishing one individual from all others.
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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