A millivolt (mV)
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The prefix meaning "one thousandth" is milli-. For example, a thousandth of a metre is a millimetre. A thousandth of a gram is called a milligram.
one-thousandth
millimeter.
What is one thousandth
The prefix for "one thousandth" is milli. Therefore, one thousandth of a second is a millisecond.