20th

20th, written with the ordinal suffix -th, is the ordinal form of the number twenty. It is used to indicate position in a sequence, such as the 20th item on a list, the 20th day of a month, or the 20th edition of a publication. As an adjective, it can modify nouns to express order, for example “the 20th century” or “the 20th-century art movement.”

In timekeeping and history, the 20th century is a common reference point. It is traditionally defined as spanning from January 1, 1901, to December 31, 2000, though some contexts refer to the years 1900–1999. The century is associated with rapid industrialization, two world wars, and major social and political changes around the world.

In U.S. constitutional law, the 20th Amendment, ratified in 1933, reorganized the scheduling of federal terms and procedures for succession. It moved the start of the presidential and vice-presidential terms to January 20 and the start of congressional terms to January 3, shortened the lame-duck period, and provided rules for vacancies and presidential disability.

In the alphabet, the 20th letter is T. The ordinal form is also used in titles, awards, and enumerations, such as “the 20th anniversary” or “the 20th edition” of a work.

Notable institutional uses include the film studio formerly known as 20th Century Fox, which was rebranded as 20th Century Studios in 2020 after a corporate change.