(definition) by Webster 1913 Wed Dec 22 1999 at 4:00:16

Twelfth"-sec`ond (?), n. Physics

A unit for the measurement of small intervals of time, such that 10^12 (ten trillion) of these units make one second.

<-- now picosecond. But-- should be thousand trillion, no??? -->

 

© Webster 1913.

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