1. coming after eight others in order or position

1. the ninth item in a series or sequence
2. one of nine equal parts of something
3. a musical interval of an octave plus a second
Usage: music

Examples

• She finished ninth in the race.
• This is the ninth book in the series.
• He lives on the ninth floor of the building.
• Today is the ninth of March.
• Each student gets one ninth of the pizza.
• The composer used a ninth chord in that passage.
• September was originally the ninth month of the Roman calendar.