世せ界かい初はつ

noun which may take the genitive case particle 'no', noun

world's first; first in the world

Used attributively with の to modify a noun, or as a noun itself. Often appears in news headlines and technical announcements.

• これは世せ界かい初はつの実じつ用よう化かです。

  This is the world's first practical application.

• 世せ界かい初はつの技ぎ術じゅつが発はっ表ぴょうされた。

  A world-first technology was announced.