い
 
つ
 
か

adverb

Usually written with kana alone.
  1. sometime, someday, one day, some time or other, the other day, in due course, in time.

Variations

Pronunciation Kanji Kana Is Common
 
い
 
つ
 
か
いつか
いつ
何時
 
か
何時か いつか