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Adjective: nightly  nIt-lee
  1. Happening every night
    "nightly television now goes on until 3:00 or 4:00 a.m."
Adverb: nightly  nIt-lee
  1. At the end of each day
    "she checks on her roses nightly";
    - every night

Sounds like: knig

See also: periodic, periodical

Encyclopedia: Nightly