陸りく海かい空くう

noun

land, sea and air

Refers to the three physical domains, often in contexts like transportation, geography, or general capability.

• 陸りく海かい空くうの交こう通つう網もうが整せい備びされている。

  The transportation network across land, sea, and air is well-developed.

noun

army, navy and air force

Specifically the three branches of the military; often used in compounds like 陸海空軍.

See also: 陸海空軍

• 陸りく海かい空くうの自じ衛えい隊たいが災さい害がい救きゅう助じょに出しゅつ動どうした。

  The army, navy, and air force self-defense units were dispatched for disaster relief.