From Longman Dictionary of Contemporary Englishoutdoorout‧door /ˌaʊtˈdɔː◂ $ -ˈdɔːr◂/ ●●○ adjective 1 [only before noun]DLOOUT/OUTSIDE existing, happening, or used outside, not inside a building OPP indoor a huge outdoor market outdoor recreational activities outdoor clothing a healthy outdoor life2 → outdoor typeUSAGE: Outdoor, outdoorsOutdoor is an adjective and outdoors is an adverb.You say: an outdoor swimming pool ✗Don't say: an outdoors swimming poolYou say: They could play outdoors. ✗Don't say: They could play outdoor.
Examples from the Corpus
outdoor• The program of outdoor activities includes skiing, climbing, and hiking.• On warm sunny days, employees can eat in a sheltered outdoor courtyard near an old-fashioned gazebo.• Already they've scaled up their fluid star-burst psychedelia into something that sounds more suited to outdoor festivals than stuffed solid mini-venues.• Most of the activities are routed through woodland and as some of the pathways can be rough outdoor footwear is recommended.• outdoor furniture• Inspired, she reaches for a Williams Sonoma cookbook in search of ideas for more summery outdoor meals.• Intrigued, the aliens monitored the few lyrics they could hear rising up from this outdoor roller ritual.• A ritual that signals for me the beginning of the outdoor season.• outdoor sports• The Form has a bar, sauna and massage rooms, an outdoor swimming pool as well as clock golf and a tennis court.• an outdoor swimming pool• The hotel has an outdoor swimming pool.• Restaurant patrons fed them scraps from their outdoor tables.• Younger volunteers tend to prefer outdoor work. 