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Pronunciation varies by accent · prefix
In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻¹⁵ (short scale quadrillionth or long scale billiardth)..
Use femto- when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Femto- means In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻¹⁵ (short scale quadrillionth or long scale billiardth)..
The closest synonym depends on the sentence and intended sense.
Possible antonyms include peta-.
Use femto- where its definition matches the intended context.
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