slack
A2CEFR level
15/100Rarity: common
TechnicalRegister
Spare time or capacity in a schedule that allows delay without knock-on impact.
There's almost no slack left in the plan, so any surprise this week will hit the delivery date.
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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