within within /wɪˈθɪn/

adverb

1. () On the inside  ( within , inside )
   on the inside
    Inside, the car is a mess
   inside, the car is a mess
   

preposition

1. () Located inside the confines or boundaries of something; not external.  ( in , inside , within )
   Located inside the confines or boundaries of something; not external.
   
2. () Inside the boundaries, limits, or scope of something.  ( within )
   Inside the boundaries, limits, or scope of something.
   
3. () Internal to a group; involving its members.  ( within , between , among , amongst )
   Internal to a group; involving its members.