第だい一いち義ぎ的てき

na-adjective

fundamental; primary; most important

Used to describe the most essential or basic aspect of something, often in formal or analytical contexts.

• この問もん題だいの第だい一いち義ぎ的てきな原げん因いんは何なんですか。

  What is the primary cause of this problem?

• 教きょう育いくの第だい一いち義ぎ的てきな目もく的てきは人にん間げん形けい成せいにある。

  The fundamental purpose of education lies in character building.