1. being number seventy in a sequence; 70th

1. the seventieth item in a series
2. one of seventy equal parts of something

Examples

• She celebrated her seventieth birthday last month.
• The seventieth anniversary of the school was marked with a special ceremony.
• He finished in seventieth place out of 200 runners.
• The seventieth page of the book contained the most important information.
• Each student received one seventieth of the total prize money.
• The seventieth day of the year falls in March.
• This is the seventieth time I’ve told you to clean your room.