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Pronunciation varies by accent · adjective
(physics) Of or pertaining to time spans of less than a femtosecond.
subfemtosecond intervals
Use subfemtosecond when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Subfemtosecond means (physics) Of or pertaining to time spans of less than a femtosecond.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
subfemtosecond intervals
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