Meanings
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1
adv
in a horizontal direction
A gallery quite often is added to make use of space vertically as well as horizontally.
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2
adv
In a horizontal direction or position.
Japanese can be written horizontally as well as vertically.
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3
adv
In a horizontal manner (any sense).
An organism transmitted horizontally.
Thesaurus
Word family
Derived forms
subhorizontally
Etymology
From horizontal + -ly.