from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One trillionth (10-12) of a second.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An SI unit of time equal to 10−12 seconds.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. one trillionth (10^-12) of a second; one thousandth of a nanosecond


From the metric prefix pico- and the word second (Wiktionary)



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