1. coming next after the nineteenth in position, time, or order; being number 20 in a sequence

1. the twentieth item in a series or sequence
2. one of twenty equal parts of something

Examples

• The twentieth century brought many technological advances.
• She finished twentieth in the race.
• Today is the twentieth of March.
• He was the twentieth person to sign up for the class.
• The museum is celebrating its twentieth anniversary.
• Only one twentieth of the students failed the exam.
• The twentieth chapter discusses climate change.