- century [sen′chə rē, sen′shərē]n.pl. centuries [L centuria < centum, HUNDRED]1. any period of 100 years, as from 1620 to 17202. a period of 100 years reckoned from a certain time, esp. from the beginning of the Christian Era (A.D. 1) [A.D. 1 through A.D. 100 is the first century A.D.; A.D. 1801 through A.D. 1900 is the 19th century A.D.; 400 B.C. through 301 B.C. is the 4th century B.C. ]: in common usage, a century begins with a year ending in 00 and runs through 99, as 1800-18993. in ancient Rome4.a) a military unit, originally made up of 100 menb) a subdivision of the people made for voting purposes5. a series, group, or amount of a hundredcenturial [sen toor′ē əl, sentyoor′ē əl]adj.
English World dictionary. V. Neufeldt. 2014.