a.

1. 垂直的，成直角的，正交的[F][（+to）]
   The two lines are perpendicular to one another.

   這兩條線相互垂直。

2. 直立的；險陡的
   It takes courage and strength to climb up the perpendicular cliff.

   攀上這懸崖峭壁需要勇氣和力量。

3. 【建】（常大寫）垂直式的
4. 【俚】（人）站立的

n.

1. 垂線；垂直面[C]
2. 垂直的位置[the S]
   The pillar had been restored to the perpendicular.

   這柱子恢復垂直。

adj.

1. at an angle of 90° to a given line, plane, or surface.
2. at an angle of 90° to the ground; vertical.
3. (Perpendicular) denoting the latest stage of English Gothic church architecture, prevalent from the late 14th to mid 16th centuries, characterized by broad arches and elaborate fan vaulting.

n.