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horizontal

noun [C usually singular]
 
 
/ˌhɒr.ɪˈzɒn.təl/ US  /ˌhɔːr.ɪˈzɑːn.t̬əl/

Definition

a horizontal line, surface, or position: Rotate it slowly from the horizontal into a vertical position.Describing angles, lines and orientations
(Definition of horizontal noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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