- ninetieth⇄adj. next after the 89th; last in a series of 90.
- ninetieth⇄ninetieth, adjective, noun.
- ninetieth⇄noun 1. the next after the 89th; last in a series of 90.
Ex. That visitor was the ninetieth to enter the museum today.
2. one of 90 equal parts.
Ex. The actress was paid a ninetieth of the earnings of the show.