Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Lasting through the night.
  • adv. Through the night; all night.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Lasting a night (i.e. the duration of one night); lasting all night.
  • adv. Through the night.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Lasting all night.

from The Century Dictionary and Cyclopedia

  • Lasting a night.
  • Through the night.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. lasting, open, or operating through the whole night

Etymologies

From Middle English *nihtlong, from Old English nihtlang ("lasting through the night, night-long, a night in length"), equivalent to night +‎ -long. (Wiktionary)
From Middle English nihtlonge, nihtlonges, from Old English nihtlanges ("for the night "), equivalent to night +‎ -long. (Wiktionary)

Examples

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  • Daylong she had been coming,
    And all the forest sang
    Of beauty: elfin-softly
    The bluebells rang.

    Nightlong she was in shadow,
    She who went away
    As the moon does in the silver
    Veils of day.

    - William Griffith, 'A Forest Rendezvous'.

    September 23, 2009