adj
horizontal
ho-rih-ZON-tuhl
adj
1
Level and flat; parallel to the ground rather than upright.
"Lay the shelf horizontal before drilling the holes."
"The table has a perfectly horizontal surface."
noun
1
A horizontal line, surface, or position.
"The bar chart plots time along the horizontal."
How to Use Horizontal
Learner’s notesIn plain EnglishLying flat or level, as opposed to vertical (upright).
Easily confused with
Common pairings
horizontal line
horizontal position
horizontal axis
Word Forms
more horizontal comparative, horizontals plural, most horizontal superlative
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Lay the shelf _____ before drilling the holes.
Etymology
From French horizontal, from horizon (see "horizon").