non est factum
C2CEFR level
93/100Rarity: very rare
TechnicalRegister
A plea that a signed document is fundamentally different in character from what the signer believed, rendering it void.
The elderly guarantor may raise non est factum, having been told he was signing a delivery receipt, not a charge.
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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