[adjective nahyt-lawng, -long; adverb nahyt-lawng, -long] /adjective ˈnaɪtˌlɔŋ, -ˌlɒŋ; adverb ˈnaɪtˈlɔŋ, -ˈlɒŋ/

lasting all night:
a nightlong snowfall.
through the entire night:
They typed nightlong to finish the reports.
adjective, adverb
throughout the night

Old English nihtlang; see night + -long.


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