Etymology
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nightfall (n.)

"the coming on of night," 1700; see night + fall (n.).

updated on June 13, 2019

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Definitions of nightfall from WordNet

nightfall (n.)
the time of day immediately following sunset;
Synonyms: twilight / dusk / gloaming / gloam / evenfall / fall / crepuscule / crepuscle
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.