noun-modifying (irregular)
Prenominal use, modifying a noun to mean the highest, final, or most extreme version of something. Often used in compound terms like アルティメット・プラン.
これはアルティメットな解決策だ。
This is the ultimate solution.
noun
Refers specifically to the team sport played with a flying disc, commonly called 'ultimate' or 'ultimate frisbee'.
週末に公園でアルティメットを楽しんだ。
We enjoyed playing ultimate frisbee at the park on the weekend.