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Meanings and definitions for 400

Year 400 (CD) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar.
400 (number), the natural number following 399 and preceding 401
A year: 400 BC or AD 400
The Four Hundred, the oligarchic government controlling Athens after the Athenian coup of 411 BC
The Four Hundred (1892), the social elite of New York City in the late 19th century
The Four Hundred (band), an American indie rock band
The Game's Four Hundred, the subtitle of the almanac, the Baseball Register
List of highways numbered 400
Twin Cities 400, a passenger train operated by Chicago & Northwestern Railway from 1935 to 1963
400 (card game), a Lebanese trick-taking game
HTTP 400, the HTTP error code for "Bad Request"