n.
   - a point beyond which something does not or may not pass or extend. 
▸a terminal point or boundary.
 ▸the furthest extent of one's endurance.
 - a restriction on the size or amount of something:
 an age limit.
 - Mathematics  a value which a sequence, function, or sum can be made to approach progressively.
 
v.
 (limits, limiting, limited)
 set or serve as a limit to.
 
  Phrase
  
    - be the limit
 informal be intolerable.  - off limits
 out of bounds.  - within limits
 up to a point; moderately. 
   
  Derivative
  
    - limitary adj. (rare).
  - limitative adj.
  - limiter n.
 
   
  Etymology
  ME: from L. limes, limit- ‘boundary, frontier’; the verb is from L. limitare, from limes.