Webster's English Dictionary

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horizontal

hor.i.zon.tal \.ho.r-*-'za:nt-*l, .ha:r-\ \-*l-e-\ aj 1a: of, relating to, 
   or situated near the horizon  1b: parallel to, in the plane of, or 
   operating in a plane parallel to the  horizon or to a base line : LEVEL {~ 
   distance ~ engine} 2: relating to or consisting of individuals of similar 
   status in a hierarc hy {~ labor unions} - horizontal n