Jisho

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Na-adjective, No-adjective, Noun
1. horizontal; level; even
Wikipedia definition
2. Horizontal planeIn geometry, physics, astronomy, geography, and related sciences, a plane is said to be horizontal at a given point if it is perpendicular to the gradient of the gravity field at that point— in other words, if apparent gravity makes a plumb bob hang perpendicular to the plane at that point. In radio science, horizontal plane is used to plot an antenna's relative field strength in relation to the ground (which directly affects a station's coverage area) on a polar graph.
Read “Horizontal plane” on English Wikipedia
Read “水平” on Japanese Wikipedia
Read “Horizontal plane” on DBpedia

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