Definitions

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

  • adj. Of or occurring during the night; nocturnal: the cat's nightly prowl.
  • adj. Happening or done every night: the physician's nightly rounds.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Happening or appearing in the night; night-time; nocturnal.
  • adj. Performing, occurring, or taking place every night.
  • adj. Used in the night.
  • adv. Every night.
  • n. A build of a software program with the latest changes, released every night.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to the night, or to every night; happening or done by night, or every night
  • adv. At night; every night.

from The Century Dictionary and Cyclopedia

  • Happening or appearing in the night: as, nightly dews.
  • Taking place or performed every night.
  • Used in the night.
  • Synonyms Nightly, Nocturnal. The former is the more familiar. Nightly tends to limitation to that which occurs every night (see definition 2), while nocturnal tends to cover both that which belongs to the night, as nocturnal insects, flowers, vision, and that which exists or occurs, however accidentally, in the night, as a nocturnal ramble.
  • By night.
  • Every night.

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

  • adj. happening every night
  • adv. at the end of each day

Etymologies

From Middle English *nightly, nyȝtly, nihtlich, from Old English nihtlīc, nihtelīc ("nocturnal, nightly, of the night, at night"), equivalent to night +‎ -ly. Cognate with Scots nichtlie ("nightly"), West Frisian nachtlik ("nightly, nocturnal"), Dutch nachtelijk ("nightly, nocturnal"), German nächtlich ("nocturnal, nightly"), Danish natlig ("nightly"), Swedish nattlig ("nightly, nocturnal"). (Wiktionary)

Examples

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