four hundred

Short definition from Wiktionary

Numeral

1. 1
   The cardinal number occurring after three hundred ninety-nine and before four hundred one, represented in Arabic numerals as 400.

Proper noun

1. 1
   A short-lived oligarchy that replaced the democratic government of ancient Athens following the Athenian coup of 411 BCE.
2. 2
   A list of the people in New York fashionable society during the Gilded Age.