A really fast thesaurus... with lots of synonyms.

(adj) :
describing the set of directions that are perpendicular with the surface of the Earth; in a two dimensional cartesian co-ordinate system, describing the axis oriented mathematically normal to (perpendicular) the horizontal axis

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for vertical:

(adj) :
describing the set of directions that are perpendicular with the surface of the Earth; in a two dimensional cartesian co-ordinate system, describing the axis oriented mathematically normal to (perpendicular) the horizontal axis