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Century

A century (from the [Latin] centum , meaning one hundred ) is [one hundred] consecutive [year] s. It is also a Roman term.
Centuries are numbered [ordinally] in English and many other languages (e.g. "the [seventh century AD/CE] ").

Start and end in the Gregorian Calendar
According to the [Gregorian calendar] , the [1st century] A.D./C.E. started on January 1, 1 and ended on December 31, 100. The [2nd century] started at year [101] , the [third] at [201] , etc. The n -th century started/will start on the year 100×n-99 and ends in 100×n . A century will only include one year, the centennial year, that starts with the century's number (e.g. ['''19'''00] is the final year in the [19th century] ).

1st century CE and BCE
There is no "zeroth century" in between the [first century BCE] and [the] [first century AD] . Also, there is no 0 AD. The Julian calendar "jumps" from 1 BC to 1 AD. The first century BC includes the years [100 BCE] to [1 BCE] . Other centuries BC follow the same pattern.

Dating units in other calendar systems
Besides the Gregorian calendar, the [Julian calendar] and the [Hindu calendar] have cycles of years which are used to delineate whole time periods; the Hindu calendar, in particular, summarizes its years into groups of 60.

Centuries in Astronomical Year Numbering
[Astronomical year numbering] , used by [astronomers] , includes a year zero (0). Consequently, the first century in these calendars may designate the years 0 to 99 as the first century, years 100 to 199 as the second etc. However, in order to regard 2000 as the first year of the twenty-first century according to the astronomical year numbering, the astronomical year 0 has to correspond to the Gregorian year 1 BC.

Alternative naming systems

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