1a period of one hundred years:a century ago most people walked to work
a period of a hundred years reckoned from the traditional date of the birth of Christ:the fifteenth century [as modifier]:a twentieth-century lifestyle
2a score of a hundred in a sporting event, especially a batsman’s score of a hundred runs in cricket:he scored the only century of the tour
3a company in the ancient Roman army, originally of a hundred men.
