restriction in WordNet English dictionary

1. the act of keeping something within specified bounds (by force if necessary)
   "the restriction of the infection to a focal area"
   restriction  confinement 
   
2. an act of limiting or restricting (as by regulation)
   limitation  restriction 
   
3. a principle that limits the extent of something
   "I am willing to accept certain restrictions on my movements"
   restriction  limitation