いっかい 一階 Common word Wanikani level 12 Play audio LinksSentence search for 一階Sentence search for いっかいSentence search for １階Kanji details for 一 and 階Edit in JMdict Noun1. first floor; ground floorNoun2. one floor; one storeyNoun3. one rankOther forms１階 【いっかい】 Discussions Log in to talk about this word.