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Synonyms

nightfall

American  
[nahyt-fawl] / ˈnaɪtˌfɔl /

noun

  1. the coming of night; the end of daylight; dusk.

    Synonyms:
    sundown, twilight

nightfall British  
/ ˈnaɪtˌfɔːl /

noun

  1. the approach of darkness; dusk

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of nightfall

First recorded in 1605–15; night + fall