'midair' definitions:

Definition of 'midair'

(from WordNet)
noun
Some point in the air; above ground level; "the planes collided in midair"

Definition of 'midair'

From: GCIDE
  • midair \mid*air"\ n. some point in the air; above ground level; as, the planes collided in midair; also used attributively; as, a midair collision. [WordNet 1.5 +PJC]