1. the number 90

1. the numbers from 90 to 99, especially when referring to someone’s age or to a decade

Examples

• There are ninety students in the graduating class.
• The temperature reached ninety degrees yesterday.
• She lived to be ninety years old.
• My grandmother is in her nineties.
• The music of the nineties was very popular.
• He scored ninety percent on the exam.
• The building has ninety floors.