Femto definitions

One quadrillionth (10−15 ).

Femtovolt.

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One quadrillionth part of; the factor 10-15

Femtosecond.

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Quadrillionth (10 to the -15th power). See femtosecond and space/time.
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See f and femtocell.
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In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10−15. Symbol: f.
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Origin of femto

From Danish Norwegian femten fifteen from Old Norse fimmtān penkwe in Indo-European roots