preventive maintenance
A2CEFR level
8/100Rarity: common
TechnicalRegister
Routine servicing carried out on a schedule to stop equipment failing rather than fixing it after it breaks.
Shifting to preventive maintenance cut emergency callouts by two-thirds.
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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