ho·​ri·​zon | \ hə-ˈrī-zᵊn How to pronounce horizon (audio) \

Definition of horizon

1a : the line where the earth seems to meet the sky : the apparent junction of earth and sky sailing toward the horizon
b : 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 — see azimuth illustration
c : range of perception or experience broaden your horizons
d : something that might be attained opening up new horizons in the field of cancer research
2a geology : a natural soil layer deposited at a particular time usually identified by distinctive fossils
b geology : any of the reasonably distinct layers of soil or its underlying material in a vertical section of land
c anthropology : a cultural area or level of development indicated by separated groups of artifacts

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Other Words from horizon

horizonal \ hə-​ˈrī-​zᵊn-​əl How to pronounce horizon (audio) \ adjective

Examples of horizon in a Sentence

We sailed toward the horizon. The sun rose slowly over the eastern horizon. These discoveries have opened up new horizons in the field of cancer research.
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Recent Examples on the Web That means Darvish profoundly understands the sizable task on the horizon. Bryce Miller Columnist, San Diego Union-Tribune, "Column: Yu Darvish surprised by trade, excited about Padres staff," 31 Dec. 2020 For now, any thoughts of exhibitions, of selling her work, or even of going back to school to get a Master of Fine Arts degree, are far off on the horizon. Richard A. Marini, ExpressNews.com, "Making art was once a career goal for S.A. woman; now it’s a way to cope with COVID-19 stresses," 31 Dec. 2020 The two planets will be visible looking toward the western horizon in the hour or so after sunset throughout most of the world and will appear to be separated by about one-fifth the diameter of the moon. Robert Lee Hotz, WSJ, "A Christmas Star? Jupiter and Saturn Alignment Sparks Comparisons," 20 Dec. 2020 As the Sun sank toward the South Texas horizon, a fantastical-looking spaceship rose into the reddening sky. Eric Berger, Ars Technica, "So, it turns out SpaceX is pretty good at rocketing," 10 Dec. 2020 To gaze out at the sheets of ice in winter, stretching toward an infinite horizon, is to take in the awe of nature itself. Star Tribune, "Here’s what you need to know to ski safely this season despite the coronavirus pandemic.," 5 Dec. 2020 On Friday morning, the moon will sink toward the horizon and appear sandwiched between Venus, on top, and Mercury, below. National Geographic, "What is that glow from Europa?," 11 Nov. 2020 So be sure to look toward the horizon around sunset. Isabel Garcia, House Beautiful, "October's Full Harvest Moon Will Light up the Sky This Week," 30 Sep. 2020 To engage in this explicit and powerful vocal expression, their voices echoing toward the horizon, claiming space, affects them in a very profound way. Jennie Tiderman-Österberg, Smithsonian Magazine, "Why Sweden’s Ancient Tradition of Calling Home the Herds Is Women’s Work," 28 Sep. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'horizon.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of horizon

14th century, in the meaning defined at sense 1a

History and Etymology for horizon

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

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Time Traveler for horizon

Time Traveler

The first known use of horizon was in the 14th century

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Statistics for horizon

Last Updated

7 Jan 2021

Cite this Entry

“Horizon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/horizon. Accessed 17 Jan. 2021.

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More Definitions for horizon


How to pronounce horizon (audio)

English Language Learners Definition of horizon

: the line where the earth or sea seems to meet the sky
: the limit or range of a person's knowledge, understanding, or experience
: the limit of what is possible in a particular field or activity


ho·​ri·​zon | \ hə-ˈrī-zᵊn How to pronounce horizon (audio) \

Kids Definition of horizon

1 : the line where the earth or sea seems to meet the sky
2 : the limit of a person's outlook or experience Reading broadens our horizons.

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