Etymology
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twentieth (adj., n.)

"next in order after the nineteenth; an ordinal numeral; being one of twenty equal parts into which a whole is regarded as divided;" 16c., from twenty + -th (1), replacing Middle English twentithe, from Old English twentigoða. The Twentieth Century Limited was an express train from New York to Chicago 1902-1967.

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Definitions of twentieth
1
twentieth (n.)
position 20 in a countable series of things;
2
twentieth (adj.)
coming next after the nineteenth in position;
Synonyms: th
From wordnet.princeton.edu