Adjective nightly has 1 sense
  1. nightly - happening every night; "nightly television now goes on until 3:00 or 4:00 a.m."
    Antonym:
    daytime (indirect, via nighttime)
,Adverbial nightly has 1 sense
  1. nightly, every night - at the end of each day; "she checks on her roses nightly"
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