He hit a home run in the 'ninth'. [=the ninth inning of a baseball game]
We'll be leaving on the 'ninth'. [=the ninth day of the month]
She's in (the) 'ninth' grade at school.
(..) Rachel, come on. Give us a chance. Ross, it's too hard. Why, because it'll get weird for everyone else? This is about us. I've been in love with you since the ninth grade. You're like my best friend. If we broke up, and I lost you... What makes you think that? Have you been involved (..)1995 TvShow: Friends Title: The One Where Rachel Finds Out Season: 1 Episode 24