Etymology
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nightly (adj.)

Middle English nightli, from Old English nihtlic "nocturnal, at night, occurring during or characteristic of the night;" see night + -ly (1). As an adverb, "every night," Middle English nihtlich (mid-15c.), from the adjective.

updated on June 13, 2019

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Definitions of nightly from WordNet
1
nightly (adv.)
at the end of each day;
she checks on her roses nightly
Synonyms: every night
2
nightly (adj.)
happening every night;
nightly television now goes on until 3:00 or 4:00 a.m.
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.