noun which may take the genitive case particle 'no'
hottest; freshest; in vogue
Slang term used in fashion, trends, and pop culture to describe something at the peak of current popularity or freshness. Often used attributively with の.
この雑誌はいつも最旬のファッションを紹介している。
This magazine always introduces the hottest fashion.
彼女は最旬のメイクを試すのが好きだ。
She likes trying the freshest makeup looks.