This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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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.

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.

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.

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.

adj. parallel to or in the plane of the horizon or a base line

n. something that is oriented horizontally

"I think seeing how much breadth someone's had, and their appetite for not just vertical career ladders, but their appetite for what I call the horizontal experiences, where it wasn't always just about a title or the next layer up."

naiant    level    crosswise    flat    swimming   

vertical   

orientation   

horizontal plane    horizontal line    horizontal root    horizontal candle-power    horizontal projection    horizontal bar    horizontal plane of camper    horizontal range of a projectile    horizontal line of camper   

flat    even    level   

consonantal    periodontal   

vertical    circular    upper    narrow    perpendicular    central    linear    jagged    angular    forward