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

Keep scrolling for more

Other Words from horizon

horizonal \ hə-​ˈrī-​zᵊn-​əl How to pronounce horizonal (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.
See More
Recent Examples on the Web During the week to come, your interest in the latest trends can broaden your horizons. Tribune Content Agency, oregonlive, "Horoscope for Nov. 24, 2019: Happy birthday Katherine Heigl; Taurus, share a meal with someone new," 24 Nov. 2019 Highest point: the time and direction the satellites will be highest above your local horizon. Trevor Mahlmann, Ars Technica, "How to spot the SpaceX Starlink satellite train overhead this week," 13 Nov. 2019 Investigate new possibilities with an eye to expanding your horizons. BostonGlobe.com, "Most read on BostonGlobe.com," 26 Sep. 2019 Also, this is a stealth way to expand your veggie and fruit horizons. Cynthia Sass, Mph, Health.com, "5 Trader Joe's New Products to Try This Fall," 17 Sep. 2019 In an effort to expand their horizons, both Charles and Saint John have recently ventured into careers as recording artists, with Saint John self-releasing his debut EP Don’t Stop Dancing. Chris Eggertsen, Billboard, "Jesse Saint John, Nija Charles & Rick Nowels Share Songwriting Secrets at SONA Summit: 'Just Don't Stop'," 16 Sep. 2019 But the camping trip really broadened my horizons and helped me start to learn about the team and who everybody is. Marco Cummings, The Denver Post, "Green Mountain’s Jesse German looking to revive football program with renewed traditions," 12 Sep. 2019 In an attempt to broaden its horizons, the NFL is making efforts to provide openings. Ben Morse, CNN, "Ex-NFL kicker Morten Anderson backs Carli Lloyd's switch from soccer," 7 Nov. 2019 Texas Take: Get political headlines from across the state sent directly to your inbox Hurd is doing what presidential hopefuls do when determined to expand their horizons. Bill Lambrecht, ExpressNews.com, "U.S. Rep. Will Hurd is quitting Congress, but not politics," 3 Nov. 2019

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.

See More

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

Keep scrolling for more

Learn More about horizon

Time Traveler for horizon

Time Traveler

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

See more words from the same century

Statistics for horizon

Last Updated

1 Dec 2019

Cite this Entry

“Horizon.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/horizon. Accessed 14 December 2019.

Keep scrolling for more

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.

Keep scrolling for more

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 assail by words or arguments

Get Word of the Day daily email!

Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble tiles that read scrabble quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!