IPA: /ˈmɪdˌɛr/
KK: /mɪdˈɛr/
A space or area in the air, away from the ground.
The bird flew gracefully in midair, performing loops and dives.
Midair → It is formed from "mid-" (meaning middle) and "air" (from Old English "æġr", meaning the atmosphere or sky). The word "midair" refers to the middle of the air or the space in the atmosphere.
Think of being in the 'middle' ('mid-') of the 'air' — that's what midair means.
No commonly confused words.