decennial
or if you were looking for the noun form
it is a decennium
or a decennary
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Another word for "Happening Quickly" is "Speedily"!
10 years is a decade
half a decade
Well, honey, if 10 years is a decade, then 5 years is half a decade. It's as simple as cutting a cake in half - except with time. So, there you have it, 5 years is half a decade. Hope that clears things up for ya!
Computers: Software, application The world: Event, activity