The decade from 1920 to 1929.

The decade from 1930 to 1939.

The decade from 1910 to 1919.

The century that began on January 1, 1900, and ended on December 31, 1999. Approximately equal to the twentieth century.

(informal) Resembling or pertaining to a totalitarian society, especially one characterised by intensive surveillance of the population.

Abbreviation of nineteenth.

Alternative form of 1960s

Alternative form of 1920s

Alternative form of 1940s

Alternative form of 1980s