/ ɪkˈstɪəriə(r); NAmE -ˈstɪr-/ noun , adjective
■ noun
1.
[ C ] the outside of sth, especially a building :
The exterior of the house needs painting.
OPP interior
2.
[ sing. ] the way that sb appears or behaves, especially when this is very different from their real feelings or character :
Beneath his confident exterior, he was desperately nervous.
■ adjective
[ usually before noun ] on the outside of sth; done or happening outdoors :
exterior walls / surfaces
The filming of the exterior scenes was done on the moors.
OPP interior
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WORD ORIGIN
early 16th cent.: from Latin , comparative of exter outer.