time is of the essence
C1CEFR level
72/100Rarity: rare
TechnicalRegister
A stipulation making punctual performance a condition, so any delay is a repudiatory breach.
Because time was of the essence, completing a single day late let the buyer walk away.
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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