Hypertext Webster Gateway: "horizontally"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Horizontally \Hor`i*zon"tal*ly\, adv.
In a horizontal direction or position; on a level; as, moving
horizontally.
From WordNet (r) 1.7 (wn)
horizontally
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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