from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of, relating to, or near the horizon.
- adj. Parallel to or in the plane of the horizon.
- adj. At right angles to a vertical line.
- adj. Occupying or restricted to the same level in a hierarchy: a horizontal study of verbal ability; a horizontal transfer by an employee.
- n. Something, such as a line, plane, or object, that is horizontal.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. perpendicular to the vertical; parallel to the plane of the horizon; level, flat.
- adj. Pertaining to the horizon.
- n. A horizontal component of a structure.
from the GNU version of the Collaborative International Dictionary of English
- adj. Pertaining to, or near, the horizon.
- adj. Parallel to the horizon; on a level.
- adj. Measured or contained in a plane of the horizon.
from The Century Dictionary and Cyclopedia
- Of or pertaining to the horizon.
- Parallel to the horizon; at right angles to the direction of gravity at any station; being on a level; not vertical nor inclined: as, a horizontal line or surface; a horizontal position.
- Measured or contained in a plane of the horizon: as, horizontal distance.
- In figured bass, a dash under a note indicating that the tones of the last figured chord are to be continued without regard to the tone of the bass.
- n. In craniometry, the line drawn from the lower edge of the orbital cavity to the middle of the ear-cavity.
- n. Anodopetalum biglandulosum, a Tasmanian plant of the family Cunoniaceæ, which sometimes forms a tree 60–70 feet high, with a trunk 4 feet in circumference.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. parallel to or in the plane of the horizon or a base line
- n. something that is oriented horizontally
French, from Latin horizōn, horizont-, horizon; see horizon.(American Heritage® Dictionary of the English Language, Fourth Edition)