Dictionary/二院にいんNiin二院 (Niin) is a Japanese noun meaning “the two houses of legislature”.Meaningsnounthe two houses of legislatureKanji in 二院二two院Inst.Related words医院doctor's office病院hospital二人two persons二死two out二度とnever again二つtwo院長director (of a hospital, institution, academy, etc.)二人ともboth (people)入院hospitalization二two２日2nd day of the month退院leaving hospital