horizon
noun
ho·ri·zon
hə-ˈrī-zᵊn 
1
a
: 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
2
a
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
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.
Recent Examples on the Web
For Southern Hemisphere observers, where the Sun sets much later, the sky doesn't get fully dark until about 9:30 p.m. By 9 p.m. on Jan. 30 in Melbourne, Australia, Saturn is just becoming visible above the western horizon, about 14 degrees high; the planet sets at 10:21 p.m. local time.
—
Jesse Emspak, Space.com, 29 Jan. 2025
Read the full Taurus Daily Horoscope Gemini (May 21 - June 21)
Your horizons are expanding at an exponential rate.
—USA TODAY, 29 Jan. 2025
Today, that same sense of possibility propels me to blend blockchain, cryptocurrency and property ownership in ways that disrupt the status quo and invite others to see new horizons.
—Gordon G. Chang, Newsweek, 25 Jan. 2025
The smoke plume dominated the northern horizon as seen in a photo, below, taken from near Magic Mountain.
—Tom Tapp, Deadline, 22 Jan. 2025
See all Example Sentences for horizon 
Examples are automatically compiled from online sources to
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Jesse Emspak, Space.com, 29 Jan. 2025
Read the full Taurus Daily Horoscope Gemini (May 21 - June 21)
Your horizons are expanding at an exponential rate.
—USA TODAY, 29 Jan. 2025
Today, that same sense of possibility propels me to blend blockchain, cryptocurrency and property ownership in ways that disrupt the status quo and invite others to see new horizons.
—Gordon G. Chang, Newsweek, 25 Jan. 2025
The smoke plume dominated the northern horizon as seen in a photo, below, taken from near Magic Mountain.
—Tom Tapp, Deadline, 22 Jan. 2025
See all Example Sentences for horizon
Dictionary Entries Near horizon
Cite this Entry
“Horizon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/horizon. Accessed 2 Feb. 2025.
Copy CitationKids Definition
horizon
noun
ho·ri·zon
ˈhə-ˈrīz-ᵊn
1
: the line where the earth or sea seems to meet the sky
2
: the limit or range of a person's outlook or experience
reading broadens our horizons
3
: a distinct layer of soil or its underlying material in a vertical section of land
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