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A unit of time equa to 10−15 s (seconds), i.e., one billionth (U.S.) of one millionth of a second, which corresponds to a frequency of one petahertz (1 PHz), about the frequency of visible violet light with a wavelength of about 0.3 μm (micron). The wavelengths of the visible spectrum range from about 0.4 μm to 0.8 μm. Common abbreviationfs.See alsomicrosecond, millisecond, nanosecond, petahertz, picosecond, second, ultraviolet, visible spectrum, wavelength.