Outdoor Out·Door Adjective ˈau̇t ˈ Performed Sports B Enclosed

out·door
\\ˈau̇t-ˌdȯr; ˈau̇t-ˈ\\ adjective
also out·doors \\-ˌdōrz, -ˌdȯrz; ˈau̇t-ˈ\\1. of or relating to the outdoors
2.
  a. performed outdoors
      outdoor sports
  b.
      an outdoor couple
3. not enclosed : having no roof
    an outdoor restaurant

outdoor
  outdoor (adj.)
  1748, from out + door. Out-of-door is from c.1800. The adv. outdoors is attested from 1817; as a noun, meaning "open spaces," the word is recorded from 1857. Outdoorsman "one who likes outdoors activities" is from 1958.

☞ outdoor
out·door / 5autdC:(r) / adjective [only before noun]
   used, happening or located outside rather than in a building
   户外的；室外的:
    outdoor clothing / activities
   户外穿的衣服/活动
   an outdoor swimming pool
   室外游泳池
   I'm not really the outdoor type (= I prefer indoor activities).
   我不是个真正喜爱户外活动的人。
   OPP 

indoor

out·door
\(ˈ) ̷ ̷| ̷ ̷\ adjective
also out·doors \(ˈ) ̷ ̷| ̷ ̷\
Etymology: out-of-door, out-of-doors
1.
 a. : of, belonging to, or characteristic of the outdoors
  < the fresh and vigorous complexion of an outdoor man — I.A.Gordon >
  < an outdoor setting >
  < an outdoor fragrance >
 b. : done or performed outdoors
  < outdoor sports >
  < outdoor exercise >
  < an outdoor concert >
 c. : not enclosed : having no roof
  < an outdoor arena >
  < an outdoor theater >
2. : given or administered outside an institution
 < outdoor relief >

 < outdoor pensions >