Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no', Adverb (fukushi), Noun
(in a) long time; long time (ago); while (ago); long ago; long while (ago); (in a) long while
see 久し振り
久々に聞いたこの曲。なつかしい。Hearing this song after so long really brings back the old times.
Also written 久久【ひさびさ】