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A decade is a period of ten years. The word is derived (via French and Latin) from the Ancient Greek: δεκάς (/ðɛkˈɑːs/, transliteration=dekas), which means a group of ten.
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.