society > inhabiting and dwelling > inhabited place > dwelling place or abode > a dwelling > a house > types of house > [adjective] > block of flats or apartments > flat or apartment > type of (2)
Originally and chiefly U.S. Of an apartment, office, etc.: that has to be reached by stairs rather than by a lift. Also of a building: consisting of…
North American (originally U.S.). Of, relating to, or designating a flat, apartment, etc., that is suitable for use by a mother-in-law or other…