nightly

• POS: Adjective, Adverb
• HYPHEN: night=ly

CIDE DICTIONARY

nightly, a. 

 Of or pertaining to the night, or to every night; happening or done by night, or every night; as, nightly shades; he kept nightly vigils.  [1913 Webster]

nightly, adv. 

 At night; every night.  [1913 Webster]

OXFORD DICTIONARY

nightly, adj. & adv.
--adj.
1 happening, done, or existing in the night.
2 recurring every night.
--adv. every night.

Etymology

OE nihtlic (as NIGHT)