noun
Refers to an unoccupied room or apartment available for rent. Common in real estate contexts.
このアパートには空き間が一つあります。
There is one vacant room in this apartment.
noun
Dated term for a physical gap or opening between objects. Modern Japanese more often uses 隙間 (すきま) or 空き (あき).
戸の空き間から風が入ってくる。
The wind comes in through the gap in the door.
Compound of 空き (あき, 'empty') + 間 (ま, 'room' or 'space'). The exact historical derivation is uncertain, but the word has been used since at least the Edo period.