nightly

1. not comparableHappening or appearing in the night; night-time; nocturnal.

   nightly dews

   1 more example

   A cobweb spread above a blossom Is sufficient to protect It from nightly chill.

   1871, John Tyndall, Fragments of Science: A Series of Detached Essays, Lectures, and Reviews

2. not comparablePerforming, occurring, or taking place every night.

   The dog demanded to go out for his nightly walk.

3. not comparableUsed in the night.

1. not comparableEvery night.

   He checks his email nightly.

   3 more examples

   It was the Nightingale, and not the Larke, / That pier'st the fearefull hollow of thine eare, / Nightly she sings on yond Pomgranet tree,

   c. 1591–1595 (date written), William Shakespeare, “The Tragedie of Romeo and Ivliet”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act III, scene v]

   This tunnel assumed some measure of importance during the second world war, when it was used nightly as an air raid shelter for multiple unit electric trains which were propelled over the branch by a steam engine.

   1952 December, R. C. Riley, “By Rail to Kemp Town”, in Railway Magazine, page 836

   I practice nightly, I try to keep ahead / This art of surfacing is all but dead

   1979, The Boomtown Rats, “Wind Chill Factor (Minus Zero)”, in The Fine Art of Surfacing

plural nightlies

1. computingA build of a software program with the latest changes, released every night.

   Depending on how brave you are, you can even set it to update to the “bleeding edge nightlies” instead of just the point release nightlies if you want to really see the cutting edge of WordPress core development.

   2014, Adam Onishi, Pro WordPress Theme Development, Apress, →ISBN, page 349