also open air
1.
An ~ place or event is outside rather than in a building.
...the Open Air Theatre in Regents Park.
...an open air concert in brilliant sunshine.
= outdoor
ADJ: usu ADJ n
2.
If you are in the open air, you are outside rather than in a building.
We sleep out under the stars, and eat our meals in the open air.
N-SING: the N, usu in the N