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Gigasecond is equal to 1 000 000 000 second (unit of time), comes from a combination of the metric prefix mega (M) with the second (s). Plural name is gigaseconds with symbol is Ms.
Millisecond is equal to 10-3 second (unit of time), comes from a combination of the metric prefix milli (m) with the second (s). Plural name is milliseconds.