Here are some of the words used for units of time. Chronon One-billionth of a trillionth of a second (the time a photon would take to cross the width of one elecctron at the speed of light) Femtosecond 0.000000000000001 of a second Picosecond 0.000000000001 (ont-trillionth ) of a second Nanosecond 0.000000001 (one-billionth) of a second Microsecond 0.000001 (one-millionth) of a second) Millisecond 0.001 (one-thousandth) of a second; the blink of an eye takes 50-80 milliseconds Centisecond 0.01 (one-hundredth) of a second Second 1/60 of a minute Minute 60 seconds Hour ...