- The definition of a century is a 100-year-long period of time.
An example of a century is the years 1800-1900.
- any period of 100 years, as from 1620 to 1720
- a period of 100 years reckoned from a certain time, esp. from the beginning of the Christian Era ( 1) [ 1 through 100 is the first century; 1801 through 1900 is the 19th century; 400 through 301 is the 4th century]: in common usage, a century begins with a year ending in 00 and runs through 99, as 1800-1899
- in ancient Rome
- a military unit, originally made up of 100 men
- a subdivision of the people made for voting purposes
- a series, group, or amount of a hundred
Origin of centuryClassical Latin centuria ; from centum, hundred
- a. A period of 100 years.b. Each of the successive periods of 100 years before or since the advent of the Christian era.
- a. A unit of the Roman army originally consisting of 100 men.b. One of the 193 electoral divisions of the Roman people.
- A group of 100 things.
Origin of centuryLatin centuria, a group of a hundred, from centum, hundred; see dek&mlowring; in Indo-European roots.
- A period of 100 consecutive years; often specifically a numbered period with conventional start and end dates, e.g., the twentieth century, which stretches from (strictly) 1901 through 2000, or (informally) 1900 through 1999. The first century AD was from 1 to 100; a yearhundred.
- A unit in ancient Roman, originally of 100 army soldiers as part of a cohort, later of more varied sizes (but typically containing 60 to 70 or 80) soldiers or other men (guards, police, firemen), commanded by a centurion.
- A political division of ancient Rome, meeting in the Centuriate Assembly.
- (archaic) A hundred things; a hundred.
- (cricket) A hundred runs scored either by a single player in one innings, or by two players in a partnership.
- (cycling) A ride 100 kilometres in length.
- (US, informal) A banknote in the denomination of one hundred dollars.
Neither the word century itself nor phrases like the twentieth century are proper nouns. Therefore "in the twentieth century", "in the 20th century", and the like should be written with lowercase letters, except in contexts (like book titles) where even common nouns are capitalized.