一いち次じ性せい

noun which may take the genitive case particle 'no'

primary; first-occurrence

Medical term used to describe a condition, disease, or disorder that arises spontaneously or is not caused by another condition. Often contrasted with 二次性 (secondary).

• 一いち次じ性せい高こう血けつ圧あつは原げん因いんが特とく定ていできないことが多おおい。

  Primary hypertension often has no identifiable cause.

• この症しょう状じょうは一いち次じ性せいのものか二に次じ性せいのものか判はん断だんが必ひつ要ようだ。

  It is necessary to determine whether this symptom is primary or secondary.