Midair
Air, Space
noun
The kanji and the word are exactly the same. That means they share meanings as well.
This has the same reading as the kanji you learned, meaning you know the reading!
コウイチのヘリコプターのラジコンは宙をまって地面にげきとつした。
Koichi's radio-controlled helicopter crashed on the ground after hovering in midair.
ポケットから札束を取り出し、宙にバラまく時のコウイチの顔が好きだ。
I like the face Koichi makes when he takes bills out of his pockets and throws them into the air.
あの問題は宙に浮いたままで、誰も議論しようとしない。
That problem is still up in the air and nobody tries to discuss it.