1. (a.) Next in order after the eighty-ninth.
2. (a.) Constituting or being one of ninety equal parts.
3. (n.) The quotient of a unit divided by ninety; one of ninety equal parts of anything.
4. (n.) The next in order after the eighty-ninth.
| Ninetieth 1. (a.) Next in order after the eighty-ninth. 2. (a.) Constituting or being one of ninety equal parts. 3. (n.) The quotient of a unit divided by ninety; one of ninety equal parts of anything. 4. (n.) The next in order after the eighty-ninth. | |