definition of nanosecond
Definitions for nanosecondËnÃ¦n ÉËsÉk Énd, ËneÉª nÉ-. nanosecond(noun) one billionth (10^-9) of a second; one thousandth of a microsecond. nanosecond(Noun) A measure of time equal to one billionth of a second.