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.
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The prefix for "one thousandth" is milli. Therefore, one thousandth of a second is a millisecond.
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False. The prefix "kilo-" means "one thousand" = 1,000. The prefix "milli-" means one thousandth = 1/1,000.