angle of elevation 名詞
 高度角,仰角


 El·e·va·tion n.
 1. The act of raising from a lower place, condition, or quality to a higher; -- said of material things, persons, the mind, the voice, etc.; as, the elevation of grain; elevation to a throne; elevation of mind, thoughts, or character.
 2. Condition of being elevated; height; exaltation. “Degrees of elevation above us.”
    His style . . .  wanted a little elevation.   --Sir H. Wotton.
 3. That which is raised up or elevated; an elevated place or station; as, an elevation of the ground; a hill.
 4. Astron. The distance of a celestial object above the horizon, or the arc of a vertical circle intercepted between it and the horizon; altitude; as, the elevation of the pole, or of a star.
 5. Dialing The angle which the style makes with the substylar line.
 6. Gunnery The movement of the axis of a piece in a vertical plane; also, the angle of elevation, that is, the angle between the axis of the piece and the line o░  sight; -- distinguished from direction.
 7. Drawing A geometrical projection of a building, or other object, on a plane perpendicular to the horizon; orthographic projection on a vertical plane; -- called by the ancients the orthography.
 Angle of elevation Geodesy, the angle which an ascending line makes with a horizontal plane.
 Elevation of the host R. C. Ch., that part of the Mass in which the priest raises the host above his head for the people to adore.

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