Meaning of “outdoor” - Learner’s Dictionary

outdoor

adjective [ always before noun ] uk us /ˌaʊtˈdɔːr/

B1 happening, used, or in a place that is outside and not inside a building:

outdoor activities
an outdoor concert
an outdoor swimming pool
outdoor clothing
→ Opposite indoor

(Definition of “outdoor” from the Cambridge Learner’s Dictionary © Cambridge University Press)