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Pronunciation varies by accent · noun
(physics) A unit of energy equal to one quadrillionth of an electronvolt, symbol feV.
Use femtoelectronvolt when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Femtoelectronvolt means (physics) A unit of energy equal to one quadrillionth of an electronvolt, symbol feV.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use femtoelectronvolt where its definition matches the intended context.
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