Definition of "90th" []

• Coming next after the eighty-ninth in a series. (adjective)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)

• "a broken nose, totaled 15 points and 13 rebounds for his 40th career double-double in 90th career game for the Bulldogs,"
• "What a great tribute, sounds like her 90th was a blast!"
• "Mustafa Kemal Ataturk "and calls the 90th anniversary of the establishment of diplomatic relations (between Leninist Russia and Kemalist Turkey) 'an important date'."