semisecond

half a second, or 500 milliseconds.

one eigth note every semisecond would be the same as a quarter note per second, or 60 beats per minute.

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semisecond

half a second, or 500 milliseconds.

as a semicircle is half a circle, a semiminute is half a minute and a semisecond is half a second, or 500 milliseconds.