The ordinal form of the number twenty.

A person or thing in the twentieth position. / One of twenty equal parts of a whole.

plural of twentieth

Usually used before century to indicate the middle part of the 20th century. The term is often used to refer to the events that occurred in the second third of the twentieth century (1933-1967). However, in architecture, preservation, and real estate, it is commonly used to refer to the period from after World War II to the mid-1970s.

(history) The period between 1914 and 1991; from the beginning of the First World War to the fall of the Soviet Union.

In the twentieth place; twentieth in a row.