What does horizonal mean?
Horizonal is a rare adjective meaning horizontal, or lying parallel to the horizon rather than tilted upward or downward. It describes a line, surface, beam, movement, or arrangement that is level and does not rise or fall. In modern usage, the standard form “horizontal” is almost always preferred, so horizonal is more likely to appear in older writing, specialized contexts, or language aimed at emphasizing the word’s connection to the horizon. The word is related to “horizon” and “horizontal,” all deriving from the Latin word for horizon, the line where the earth appears to meet the sky. Though uncommon, horizonal is a clear and economical example of how one word can preserve a relationship among related forms while remaining outside ordinary everyday vocabulary.
adjectiveLying or extending in a horizontal direction; parallel to the horizon. The word is a rare variant or less common derivative of “horizontal.”
- Lying or extending in a horizontal direction; parallel to the horizon.
"The beam formed a horizonal line across the upper part of the chamber."
"The trail continued in a roughly horizonal direction along the ridge."
"Her description gave a horizonal impression of the landscape, emphasizing its flatness."
A rare word that points directly toward the horizon: it means lying level rather than rising or falling.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does horizonal come from?
Horizonal was formed in English from “horizon” with the suffix “-al,” in parallel with the more familiar “horizontal.” These words ultimately derive from Latin horizont-, meaning “horizon” or “level,” from the Greek horizein, “to bound or separate.” The form belongs to the same broad family as “horizon,” “horizontal,” and “horizontally.”
How horizonal is actually used
This is a rare and nonstandard form. In contemporary English, “horizontal” is normally preferred.
Easily confused with horizonal
“Horizontal” is the standard modern adjective for something lying parallel to the horizon, whereas “horizonal” is a rarer and less usual form.