horizon

/hə-ˈrī-zᵊn/

Middle English orizon, from Late Latin horizont-, horizon, from Greek horizont-, horizōn, from present participle of horizein to bound, define, from horos boundary; perhaps akin to Latin urvum curved part of a plow

noun

  1. the line where the earth seems to meet the sky : the apparent junction of earth and sky

  2. the great circle on the celestial sphere formed by the intersection of the celestial sphere with a plane tangent to the earth's surface at an observer's position

  3. range of perception or experience

sailing toward the horizon

noun

  1. the uppermost dark-colored layer of a soil consisting largely of partly disintegrated organic debris

noun

  1. a gyroscopic flight instrument designed to indicate aircraft attitude with respect to the true horizon