NIGHTLONG
Meaning of NIGHTLONG in English
I. -ˌlȯŋ adjective
Date: 1612
: lasting the whole night
nightlong festivities
II. -ˈlȯŋ adverb
Date: 1870
: through the whole night
Merriam-Webster's Collegiate English vocabulary.
Энциклопедический словарь английского языка Merriam Webster.
2003