nightly

adjective

1. coming or occurring each night: his nightly walk to the newsstand.
2. coming, occurring, appearing, or active at night: nightly revels.
3. of, relating to, or characteristic of night: the nightly gloom before a storm.

adverb

4. on every night: performances given nightly.
5. at or by night: an animal that is seen nightly.

adjective

1. happening or relating to each night
2. happening at night

adverb

3. at night or each night

adj.

Old English nihtlic “nocturnal, of the night, at night;” see night + -ly (1). As an adverb, Middle English nihtlich, from the adjective.