Happening or appearing in the night; night-time; nocturnal.
A cobweb spread above a blossom Is sufficient to protect It from nightly chill. — Tyndall.
Performing, occurring, or taking place every night.
The dog demanded to go out for his nightly walk.
Used in the night.
A build of a software program with the latest changes, released every night.
Every night.
He checks his email nightly.