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Megasecond is equal to 1 000 000 second (unit of time), comes from a combination of the metric prefix mega (M) with the second (s). Plural name is megaseconds with symbol isMs.
Kilosecond is equal to 1000second (unit of time), comes from a combination of the metric prefix kilo (k) with the second (s). Plural name is kiloseconds with symbol isks.