Milli- (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10^-3). Proposed in 1793 and adopted in 1795, the prefix comes from the Latin , meaning "one thousand" (the Latin plural is ). Since 1960, the prefix is part of the International System of Units (SI).

Milli- (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10^-3). Proposed in 1793 and adopted in 1795, the prefix comes from the Latin , meaning "one thousand" (the Latin plural is ). Since 1960, the prefix is part of the International System of Units (SI).