[1] : The Collaborative International Dictionary of English v.0.48

outdoors \out"doors`\, adv.
   out of the house; out of doors; in the open air; abroad.
   1913 webster +pjc

[2] : WordNet (r) 2.0

outdoors
     n : where the air is unconfined; "he wanted to get outdoors a
         little"; "the concert was held in the open air"; "camping
         in the open" syn: out-of-doors, open air, open
     adv : outside a building; "in summer we play outside" syn: outside,
            out of doors, alfresco ant: inside, inside
see also:
out-of-doors open air open outside out of doors alfresco 
inside 

Outdoors >> O Words
Outdoors, definition of term: Outdoors
outdoors_pag1.html