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Definition of horizontal adjective from the Oxford Advanced Learner's Dictionary

  

horizontal

 adjective
adjective
BrE BrE//ˌhɒrɪˈzɒntl//
 
; NAmE NAmE//ˌhɔːrəˈzɑːntl//
 
, NAmE//ˌhɑːrəˈzɑːntl//
 
 
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 flat and level; going across and parallel to the ground rather than going up and down horizontal lines (informal) I was so tired, I just wanted to be horizontal (= lying down). compare vertical Word Origin mid 16th cent. (originally meaning something of or at the horizon): from French, or from modern Latin horizontalis, from late Latin horizon, horizont-, from Greek horizōn (kuklos) ‘limiting (circle)’.
See the Oxford Advanced American Dictionary entry: horizontal

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