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A fortnight is a unit of time equal to 14 days (2 weeks). The word derives from the Old English: fēowertyne niht, meaning "fourteen nights".
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.