- IPA: /naɪn.tiːn.ˈhʌn.dɹədz/ ("nineteen hundreds")
- The century that began on January 1, 1900, and ended on December 31, 1999. Approximately equal to the twentieth century.
- (rare) The decade that began on January 1, 1900 and ended on December 31, 1909. The noughties.