Plural form of centennium; periods of 100 years or pertaining to 100-year cycles.
From Latin 'centennium' (a period of 100 years), from 'centum' (hundred) + '-ennium' (year span). The Latin plural 'centennia' forms by changing '-ium' to '-ia.'
The term 'centennium' appears mostly in scientific and astronomical contexts where researchers need to discuss time periods larger than decades but smaller than millennia—it's the forgotten middle child of time measurement.
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