efficiency apartmentBrE /ɪˈfɪʃənsi əpɑːtmənt/ 🔊NAmE /ɪˈfɪʃənsi əpɑːrtmənt/ 🔊 (also efˈficiency unit, ef·fi·ciency) noun (NAmE) a small flat/apartment with one main room for living, cooking and sleeping in and a separate bathroom 一厅小套房，简易小寓房（起居室、厨房和寝区在同一个房间里，有独立盥洗室）