A2a period of 100 years: The city centre has scarcely changed in over a century.This sculpture must be centuries old.Her medical career spanned half a century.→ ComparemillenniumDecades, centuries and the millennium›a period of 100 years counted from what is believed to be the year of the birth of Jesus Christ: Rome was founded in the eighth century BC (= before Christ).He's an expert on 15th-century Italian art.Decades, centuries and the millennium›a score of 100 runs in cricketCricketGeneral terms used in ball sportsthe turn of the century›the time when one century ends and another begins: The museum reopened at the turn of the century.Decades, centuries and the millennium