What it means

1. adjective originating or belonging beyond some bounds
   “the outside world”
2. adjective on or toward an outer edge
   “an outer lane”
3. adjective functioning outside the boundaries or precincts of an organized unit
   “extramural hospital care and treatment”
4. adjective very unlikely
   “an outside chance”
5. adjective relating to or being on or near the outer side or limit
   “an outside margin”
6. adjective (of a baseball pitch) on the far side of home plate from the batter
   “the pitch was away (or wide)”
7. adjective coming from the outside
   “extraneous light in the camera spoiled the photograph”
8. adjective located, suited for, or taking place in the open air
   “outdoor clothes”
9. noun the outer side or surface of something
10. noun the region that is outside of something
11. adverb outside a building
    “in summer we play outside”
12. adverb on the outside
    “outside, the box is black”