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The unit zero
No, the Ancient Greek number system did not use zero as a place value, or number for that matter.
around 1000 BCE
centi comes from the Latin word for 100. In the metric system it means 1/100, as the Latin prefixes mean reciprocal multipliers [1/10, 1/100, 1/1000, etc], and Greek prefixes are the 'normal' multipliers [10, 100, 1000, etc.]
Yes but only out of historical interest.