estoppel by convention
C2CEFR level
99/100Rarity: very rare
TechnicalRegister
A bar preventing parties who have dealt on a shared assumption from later denying it to the other's detriment.
Both sides invoiced at the higher rate for years, so estoppel by convention stops the buyer disputing it now.
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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