postal rule
C2CEFR level
80/100Rarity: very rare
TechnicalRegister
The rule that acceptance by post takes effect when the letter is posted, not when it is received.
Under the postal rule, the contract was formed the moment the acceptance was dropped in the letterbox.
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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