- 1 flat and level; going across and parallel to the ground rather than going up and down horizontal lines
- 2(informal) I was so tired, I just wanted to be horizontal (= lying down). compare vertical
- NAmE//ˌhɔrəˈzɑntəli//, NAmE//ˌhɑrəˈzɑntəli//adverb Cut the cake in half horizontally and spread frosting on one half.
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