outdoor
adj.adj. happening or used outside a building rather than inside. You use this to describe activities like camping or furniture made for a garden.
adj. located, occurring, or used in the open air rather than inside a building.
We bought some new outdoor furniture for the patio.
The city organizes several outdoor concerts during the summer months when the weather is warm.
While the museum houses most of its collection inside, several large-scale bronze sculptures are displayed in the outdoor courtyard to take advantage of natural light.
From out- + door.
Attributive adjective — almost always placed before the noun it modifies.
I like to play outdoorI like to play outdoorsOutdoor is an adjective and must modify a noun; outdoors is the adverb used to describe where an action happens.