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Milli (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10−3). Adopted in 1795, the prefix comes from the Latin mille, meaning one thousand (the plural is milia).
- The metric system was introduced in 1795 with several metric prefixes, of which, however, only six were adopted as SI prefixes by the 11th CGPM conference in 1960, whereas myria (ma, 104) and myrio (mo, 10-4) as well as double and demi were not adopted. In 1873, micro and mega were recommended by the British Association for the Advancement of Science. The other dates relate to recognition by a resolution of the CGPM.
- "NIST Guide to the SI".See section 4.3 Decimal multiples and submultiples of SI units: SI prefixes, Table 5.