Definition of horizontally adverb from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌhɒrɪˈzɒntəli//
; NAmE NAmE//ˌhɔːrəˈzɑːntəli//
, NAmE//ˌhɑːrəˈzɑːntəli//
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in a way that is flat and level; across and parallel to the ground rather than up and down Cut the cake in half horizontally and spread jam on one half.