Meaning of “outside” - Learner’s Dictionary

outside

adjective [ always before noun ] us uk /ˌaʊtˈsaɪd/
Extra Examples
He's painting the outside walls of the house.The old house still had an outside toilet.The vent lets outside air into the building.The outside walls of the temple are covered with inscriptions.The bar has an outside seating area.
NOT INSIDE

B2 not in a building:

an outside light
outside activities
DIFFERENT

from a different organization or group of people:

outside help
outside influences
→ See also the outside world

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