a small apartment consisting typically of a combined living room and bedroom area, a bathroom, and a kitchenette.
Origin of efficiency apartment
First recorded in 1925–30
Also called efficiency.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
US a small flat or bedsit
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012