noun
Physical or abstract empty area; can refer to a blank, a gap, or available room.
駐車場に空きがなかった。
There was no empty space in the parking lot.
スケジュールに空きを作ってください。
Please make some room in the schedule.
noun
Specifically for positions, seats, or roles that are available or unoccupied.
この便にはまだ空きがありますか。
Are there still seats available on this flight?
会社に空きが出たら連絡します。
I'll let you know if a position opens up at the company.
noun, noun which may take the genitive case particle 'no'
free time; time to spare
Unoccupied time in one's schedule; often used with 時間 or 手.
明日は空き時間がたくさんある。
I have a lot of free time tomorrow.
午後に少し空きがあります。
I have a little free time in the afternoon.
noun, noun which may take the genitive case particle 'no'
disuse; unused thing
Something not currently in use; often appears in compounds like 空き家 (empty house) or 空き缶 (empty can).
空き家が増えている。
The number of vacant houses is increasing.
空き缶はリサイクルに出してください。
Please put empty cans out for recycling.
Noun form of the verb 空く (あく, 'to become empty'). The kanji 空 carries the core meaning of 'empty' or 'sky'.