What does horizon mean?
A horizon is the apparent line where the earth’s surface seems to meet the sky, especially as seen from a particular place or viewpoint. The word also refers more broadly to the limits of what can be perceived, known, or achieved. For example, a person may speak of exploring new horizons when undertaking an unfamiliar experience or acquiring new knowledge. In news and political writing, “a new horizon” can mean a new stage or possibility in a continuing process. The phrase “point on the horizon” is common for something distant and only just visible, while “broaden one’s horizons” means to expand one’s knowledge or range of experience. Although the visible horizon changes with the observer’s position, it is culturally associated with discovery, possibility, and the unknown.
nounThe apparent line where the earth’s surface meets the sky, or the limit of what can be seen or known. In figurative use, it refers to the boundary of a person’s knowledge, experience, or possibilities.
- The apparent boundary where the earth’s surface meets the sky.
- The furthest limit of what can be seen from a particular viewpoint.
- The limit of a person’s knowledge, experience, or awareness.
- A period or stage in a broader process, especially a point of change or development.
"The mountains were barely visible on the horizon."
"The sun rose slowly above the horizon."
"Travel broadens the mind and changes one’s horizons."
"The agreement marks a new horizon in the country’s economic development."
Used when referring to multiple boundaries, areas of knowledge, or stages of development; the plural is especially common in figurative expressions.
"The project opened up new horizons for the research team."
The horizon is not a fixed place: it shifts as you travel, yet it has inspired people to imagine new worlds for centuries.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does horizon come from?
The word comes through Latin from Greek, where horos meant a boundary or limit. The Greek verb horizein meant to bound or delimit, and its derivative horizon referred to the boundary of the visible earth. English borrowed the Latin form in the late 14th century, initially for the line marking the apparent limit of the earth’s surface. The same Greek root contributed to words such as horizontal and, through a related sense of time or season, hour.
Related word forms
How horizon is actually used
The word is common in both formal and informal English. Its figurative senses often suggest a limit that can be expanded through learning, travel, or experience.
Easily confused with horizon
A horizon is a boundary or limit, while something horizontal runs parallel to a flat surface or positioned at right angles to a vertical line.