fidelity
B2CEFR level
20/100Rarity: fairly common
FormalRegister
Faithfulness and loyalty to a person, cause or commitment.
Her lifelong fidelity to the project outlasted three changes of government.
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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