One thousandth of
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They mean: centi as in centimeter is 1/100 of a meter and milli as in millimeter is 1/1000 of a meter
A million
55 milli meters
"milli-" comes from the Latin noun "mīlle", meaning a thousand, or "mīlia" for the plural form (thousands)
0.001 or 1/1000 of a second