Century  n. (pl. -ies) 1 a 100 years. B any century reckoned from the birth of christ (twentieth century = 1901–2000; fifth century bc = 500–401 bc). 2 score etc. Of 100 esp. By one batsman in cricket. 3 company in the ancient roman army, orig. Of 100 men. [latin centuria: related to *cent]