1. 
[syn: outdoor(a), out-of-door, outside]
2.  pertaining to or concerning the outdoors or outdoor activities; 
- Example: "outdoor education is the area of teacher training concerned with training for outdoor activities"
The Collaborative International Dictionary of English v.0.48:
Outdoor \Out"door`\, a. [For out of door.]
   Being, or done, in the open air; being or done outside of
   certain buildings, as poorhouses, hospitals, etc.; as,
   outdoor exercise; outdoor relief; outdoor patients.
   [1913 Webster]
WordNet (r) 3.0 (2006):
outdoor
    adj 1: located, suited for, or taking place in the open air;
           "outdoor clothes"; "badminton and other outdoor games";
           "a beautiful outdoor setting for the wedding" [syn:
           outdoor(a), out-of-door, outside] [ant:
           indoor(a)]
    2: pertaining to or concerning the outdoors or outdoor
       activities; "outdoor education is the area of teacher
       training concerned with training for outdoor activities"