nightly

Nightly is an English adjective and adverb meaning occurring or active during the night, or occurring every night. When used as an adjective, it describes things related to the night; as an adverb, it means on each night. The word is formed from night plus the suffix -ly and is attested in Middle English.

Common uses include describing recurring nighttime activities, such as nightly patrols or nightly routines. In technical contexts, nightly describes releases or builds produced automatically at night for testing and development. Nightly builds allow developers to access the latest changes soon after they are committed, often with more frequent updates than stable releases. The Mozilla project maintains a Nightly channel where developers test new Firefox features by nightly builds.

In journalism and broadcasting, nightly appears in the names of programs and in descriptions of news coverage aired in the evenings, such as NBC Nightly News. While not all networks use the term in titles, it is widely understood as indicating a night-time edition of a news program or a summary of events from the day.

Overall, nightly functions as a general descriptor for night-time activity and, in software and media contexts, as a label for nightly releases or broadcasts that occur during the night.