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Definition of horizontal


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Houghton Mifflin

hor·i·zon·tal  audio  (hôr-zntl, hr-) KEY 

ADJECTIVE:
  1. Of, relating to, or near the horizon.
    1. Parallel to or in the plane of the horizon.
    2. At right angles to a vertical line.
  2. Occupying or restricted to the same level in a hierarchy: a horizontal study of verbal ability; a horizontal transfer by an employee.
NOUN:
Something, such as a line, plane, or object, that is horizontal.

ETYMOLOGY:
French, from Latin horizn, horizont-, horizon ; see horizon

OTHER FORMS:
hori·zon·tali·ty  (-zn-tl-t) KEY  or hori·zontal·ness(Noun), hori·zontal·ly(Adverb)


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