downward (adv.)

"from a higher to a lower place, state, or condition," late 12c., from down (adv.) + -ward. As a preposition, "down," by late 14c. As an adjective, "moving or tending from a higher to a lwer place, state, or condition," from 1550s. As an adverb Old English had aduneweard. Downwards (c. 1200), with adverbial genitive, had a parallel in Old English ofduneweardes.

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Definitions of downward from WordNet
downward (adj.)
on or toward a surface regarded as a base;
he lay face downward
the downward pull of gravity
downward (adj.)
extending or moving from a higher to a lower place;
the downward course of the stream
Synonyms: down
downward (adv.)
spatially or metaphorically from a higher to a lower level or position;
prices plunged downward
Synonyms: down / downwards / downwardly