The metric prefix meaning one million is mega-, as in megabyte.
The metric prefix meaning one-millionth is micro-, as in micrometer.
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The metric system prefix for 1 million is mega- (symbol: M).
The prefix "deci" means one tenth. A decimeter is is one tenth of a meter.However, this prefix is not an approved part of the Metric System (SI).The prefix that means one-tenth is deci. The symbol for deci is d. It is a prefix used in the metric system.
The metric prefix for 0.001 is milli-.
The prefix that means thousands in the metric system is "kilo-". It represents a factor of 1000.