ho·​ri·​zon | \hə-ˈrī-zᵊn \

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 \ 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

LCACs are ship to shore connector vehicles able to transport Marines and equipment from ship-to-shore beyond the horizon. Kris Osborn, Fox News, "Navy pushes for more amphibious assault ships," 13 July 2018 Here’s a good way to stay loose when a World Cup semi-final is on the horizon and an entire nation is biting its collective nails. Charles Curtis, For The Win, "7 wacky photos of England's World Cup team training with a rubber chicken," 10 July 2018 Although rain and clouds threaten the sky tonight, the pink light of the strawberry moon will still shine through a hazy horizon and illuminate the sky. Susan Selasky And Emma Tomsich, Detroit Free Press, "Strawberry moon, Saturn to light up sky tonight," 27 June 2018 Your allocation among these three categories is a function of your personal risk tolerance, time horizon and rate of return goals. Michael J. Francis, Milwaukee Journal Sentinel, "401(k) Adviser: Let strategy, not fear of emulating Wile E. Coyote, be your guide," 22 June 2018 Their pinging looped guitar lines and bone-dry minimal drums together with Coulson’s mannered, yearnsome bellowing inform a sense that their songs could extend beyond the horizon and go on forever. Leor Galil, Chicago Reader, "Chicago’s Shy Technology impart new life into outmoded forms of indie rock," 25 May 2018 That Year 3 bump was on the horizon and the Collin Sexton hype was growing by the day. Michael Casagrande, AL.com, "Why Alabama basketball thinks people 'underestimate' next team," 1 May 2018 In his mental vision there were no millions of minds beyond the immediate horizon. Phillip Morris, cleveland.com, "Remove the stain of Jack Johnson's conviction from history: Phillip Morris," 25 Apr. 2018 Prince Harry and Meghan Markle seem to have pretty much everything — a picture-perfect relationship, a dream wedding on the horizon, and dope house, etc. Emma Baty, Cosmopolitan, "Meghan Markle and Prince Harry Officially Have Their Own Wedding Beer," 14 Mar. 2018

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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Statistics for horizon

Last Updated

6 Oct 2018

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Time Traveler for horizon

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

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More Definitions for horizon



English Language Learners Definition of horizon

the 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 \

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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Comments on horizon

What made you want to look up horizon? Please tell us where you read or heard it (including the quote, if possible).


to express warning or disapproval

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