出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/08/29 05:25:52」(JST)
センチュリー (century) は、英語で100年、世紀などを意味する。ラテン語で「100の集合」を意味するケントゥリア（centuria）を語源とする。
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A century (from the Latin centum, meaning one hundred; abbreviated c.[1]) is 100 years. Centuries are numbered ordinally in the English language along with many others (e.g. "the 7th century AD/CE"). A centenary is a hundredth anniversary or a celebration of this, typically the remembrance of an event which took place a hundred years earlier. Its adjectival form is centennial.
According to the Gregorian calendar, the 1st century AD/CE started on January 1, 1, and ended on December 31, 100. The 2nd century started at year 101, the 3rd at 201, etc. The n-th century started/will start on the year (100 × n) − 99 and ends in 100 × n.[2] A century will only include one year, the centennial year, that starts with the century's number (e.g. 1900 is the final year of the 19th century).
There is no "zeroth century" in between the 1st century BC and the 1st century AD. Also, there is no year 0 AD.[3] The Julian calendar "jumps" from 1 BC to 1 AD. The first century BC includes the years 100 BC to 1 BC. Other centuries BC follow the same pattern.
Besides the Gregorian calendar, the Julian calendar, the Aztec calendar, and the Hindu calendar have cycles of years that are used to delineate whole time periods; the Hindu calendar, in particular, summarizes its years into groups of 60,[4] while the Aztec calendar considers groups of 52.[5]
Astronomical year numbering, used by astronomers, includes a year zero (0). Consequently, the 1st century in these calendars may designate the years 0 to 99 as the 1st century, years 100 to 199 as the second, etc. Therefore, in order to regard 2000 as the first year of the 21st century according to the astronomical year numbering, the astronomical year 0 has to correspond to the Gregorian year 1 BC.
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In Swedish, Danish, Norwegian, Icelandic and Finnish, besides the ordinal naming of centuries another system is often used based on the hundreds part of the year, and consequently centuries start at even multiples of 100. For example, Swedish nittonhundratalet (or 1900-talet), Danish nittenhundredetallet (or 1900-tallet), Norwegian nittenhundretallet (or 1900-tallet) and Finnish tuhatyhdeksänsataaluku (or 1900-luku) refer unambiguously to the years 1900–1999.
The same system is used informally in English. For example, the years 1900–1999 are sometimes referred to as the nineteen hundreds (1900s). This is similar to the English decade names (1980s, meaning the years 1980–1989).
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