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/ˈfɜː(ɹ)mi/ · noun
An obsolete name of the unit of length equal to one femtometre (10⁻¹⁵ m)..
Use fermi when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Fermi means An obsolete name of the unit of length equal to one femtometre (10⁻¹⁵ m)..
Common synonyms include femtometer, femtometre.
The opposite depends on the specific sense.
Use fermi where its definition matches the intended context.
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