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Definitions for Horizon

[1] the line or circle that forms the apparent boundary between earth and sky.
[2] Astronomy . the small circle of the celestial sphere whose plane is tangent to the earth at the position of a given observer, or the plane of such a circle (sensible horizon) . Also called rational horizon . the great circle of the celestial sphere whose plane passes through the center of the earth and is parallel to the sensible horizon of a given position, or the plane of such a circle (celestial horizon) .
[3] the limit or range of perception, knowledge, or the like.
[4] Usually horizons . the scope of a person's interest, education, understanding, etc.: His horizons were narrow.
[5] Geology . a thin, distinctive stratum useful for stratigraphic correlation.
[6] Also called soil horizon . any of the series of distinctive layers found in a vertical cross section of any well-developed soil.
[7] Also called: visible horizon , apparent horizon the apparent line that divides the earth and the sky
[8] astronomy Also called: sensible horizon the circular intersection with the celestial sphere of the plane tangential to the earth at the position of the observer Also called: celestial horizon the great circle on the celestial sphere, the plane of which passes through the centre of the earth and is parallel to the sensible horizon
[9] the range or limit of scope, interest, knowledge, etc
[10] a thin layer of rock within a stratum that has a distinct composition, esp of fossils, by which the stratum may be dated
[11] a layer in a soil profile having particular characteristics See A horizon, B horizon, C horizon
[12] on the horizon likely or about to happen or appear

Words related to Horizon

prospect, scope, boundary, perspective, purview, vista, realm, ken, stretch, reach, sphere, range, limit, compass, border

Words nearby Horizon

horehound, horgan, hori, horiatiki, horite, horizon, horizon club, horizon distance, horizonless, horizontal, horizontal bar

Origin of Horizon

1540–50; < Latin horizōn < Greek horízōn (kýklos ) bounding (circle), equivalent to horíz(ein ) to bound, limit + -ōn present participle suffix (nominative singular); replacing Middle English orizonte < Middle French < Latin horizontem, accusative of horizōn

Word origin for Horizon

C14: from Latin, from Greek horizōn kuklos limiting circle, from horizein to limit, from horos limit

Synonyms for Horizon

boundary, perspective, prospect, scope, border, compass, ken, limit, purview, range, reach, realm, sphere, stretch, vista, field of vision