Picosecond has 2 different meanings across 1 category:
Noun
one trillionth (10^-12) of a second; one thousandth of a nanosecond
An SI unit of time equal to 10^(−12) seconds. Symbol: ps
The word picosecond combines the metric prefix pico- with the unit of time, second. It refers to one trillionth of a second.