noun
restriction
rih-STRIK-shuhn/rɪˈstrɪkʃn/
A limit on what can be done or allowed.
The height restriction stops the tall truck while allowing the small car through.

Etymology
The underlying image is binding something tight or holding it back. This physical restraint became a general idea of limitation, including a rule that holds actions within permitted bounds.
In context
common legitimate restriction to freedom of expression that is referred to as incitement speech and as hate speech
More examples
- Is there an age restriction for this contest?
- Her doctor lifts the restriction on exercise.
- This ticket comes with restrictions on refunds and exchanges.
Forms
restriction · restrictions
restrict verb — To limit what someone can do.
restrictive adjective — Limiting what people can do freely.
Similar words
- limit
- Can mark a maximum amount rather than something forbidden.
- constraint
- Often limits choices through practical circumstances rather than explicit rules.