A unit of length equal to one-thousandth of a meter, or about the thickness of a grain of rice.
From French 'millimètre,' combining 'mille' (Latin for 'thousand') and 'metre' (from Greek 'metron' meaning 'measure'). Created during the French Revolution when the metric system was invented in 1793.
The metric system was designed to be logical and universal—one millimetre is defined by nature itself, based on the distance light travels in a specific tiny fraction of a second, making it more accurate than any human measurement!
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