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Adverb: horizontally  ,hor-u'zón-t(u-)lee or ,hór-i'zón-t(u-)lee [N. Amer], ,hó-ri'zón-t(u-)lee [Brit]
  1. In a horizontal direction
    "a gallery quite often is added to make use of space vertically as well as horizontally"

Encyclopedia: Horizontally