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/kwɑˈdrɛniəm/ · noun
A period of 4 years, particularly (historical) the sets of four years in the ancient Egyptian and Greek calendars..
Use quadrennium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Quadrennium means A period of 4 years, particularly (historical) the sets of four years in the ancient Egyptian and Greek calendars..
Common synonyms include tetraeteris, tetraeterid, olympiad.
The opposite depends on the specific sense.
Use quadrennium where its definition matches the intended context.
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