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

      

    vertical

     adjective
    adjective
    BrE BrE//ˈvɜːtɪkl//
     
    ; NAmE NAmE//ˈvɜːrtɪkl//
     
     
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  1. 1  (of a line, pole, etc.) going straight up or down from a level surface or from top to bottom in a picture, etc. the vertical axis of the graph The cliff was almost vertical. There was a vertical drop to the ocean. compare horizontal
  2. 2having a structure in which there are top, middle and bottom levels a vertical flow of communication
  3. 3(medical) passed from one generation to the next 4% of these infections result from vertical transmission from mother to baby.
  4. Word Origin mid 16th cent. (in the sense ‘directly overhead’): from French, or from late Latin verticalis, from vertex ‘whirlpool, crown of a head, vertex’, from vertere ‘to turn’.
See the Oxford Advanced American Dictionary entry: vertical