the line or circle that forms the apparent boundary between earth and sky.
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 ).
the limit or range of perception, knowledge, or the like.
Usually ho·ri·zons . the scope of a person's interest, education, understanding, etc.: His horizons were narrow.
Geology. a thin, distinctive stratum useful for stratigraphic correlation.
Also called soil ho·ri·zon . any of the series of distinctive layers found in a vertical cross section of any well-developed soil.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use horizon in a sentence
Others have linked the animal carvings at the site to specific constellations, proposing that a scorpion depicted underground might represent Scorpio below the horizon.An Ancient Site with Human Skulls on Display - Issue 89: The Dark Side | Jo Marchant | September 2, 2020 | Nautilus
The post While cut media company pay might be returning soon, confidence in the ad marketplace not on the horizon appeared first on Digiday.While cut media company pay might be returning soon, confidence in the ad marketplace not on the horizon | Max Willens | September 2, 2020 | Digiday
Always look to broaden your horizon, as new customers await your amazing products!How to use in-market audiences for better search campaigns | Harikrishna Kundariya | August 18, 2020 | Search Engine Watch
Brands need to be developing the strategies and at least have these issues on the horizon.SEO in the second half of 2020: Five search opportunities to act on now | Jim Yu | August 17, 2020 | Search Engine Watch
With stay-at-home orders on the horizon, “our business just dried up immediately,” he says.
But without any peace talks on the horizon, everyone is now left to their own devices.In the Middle East, the Two-State Solution Is Dead | Dean Obeidallah | January 2, 2015 | THE DAILY BEAST
They can hear the sound of his boat's motor, growing louder as it comes over the horizon.Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days | David Freeman | December 13, 2014 | THE DAILY BEAST
Ebah, speaking from his home in the camp, said suggestively, “There are signs of a big thing on the horizon.”Intifada 3.0: Growing Unrest and a Plot to Kill an Israeli Minister | Creede Newton | November 21, 2014 | THE DAILY BEAST
In many ways, Kansas City is a leaving town, a place for pioneers and rovers with an eye on the distant horizon.
But with the 2016 presidential season on the horizon, the Texas firebrand has subtly changed his tune over the last six months.
See how those distant peaks rise serenely over the southern horizon!
The sky was alight from zenith to horizon, the Nile aflame with sunrise, by the time the letter was written.The Wave | Algernon Blackwood
The grand mountain-top bearing that name he had known well in many a distant horizon.Ramona | Helen Hunt Jackson
He saw the Theban Hills rolling their dark, menacing wave along the far horizon.The Wave | Algernon Blackwood
The horizon, however, was lowering and hazy, and the sun had not force enough to tear the murky veil asunder.A Woman's Journey Round the World | Ida Pfeiffer
British Dictionary definitions for horizon
Also called: visible horizon, apparent horizon the apparent line that divides the earth and the sky
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
the range or limit of scope, interest, knowledge, etc
a thin layer of rock within a stratum that has a distinct composition, esp of fossils, by which the stratum may be dated
on the horizon likely or about to happen or appear
- horizonless, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for horizon
The apparent intersection of the Earth and sky as seen by an observer. Also called apparent horizon
: See celestial horizon.
: See sensible horizon.
A specific position in a stratigraphic column, such as the location of one or more fossils, that serves to identify the stratum with a particular period.
A specific layer of soil or subsoil in a vertical cross-section of land.
Archaeology A period during which the influence of a particular culture spread rapidly over a defined area.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Other Idioms and Phrases with horizon
see on the horizon.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.