twentieth 2022.12.06 twentiethとは 意味・定義・例文 n, adj, adv 1. 20th in numbering order 20番目 The twentieth century was a century that began on January 1, 1901 and ended on December 31, 2000. 2. the 20th person or thing 20番目の人[もの] 3. one of 20 equal parts of a thing; one twentieth(1/20)