Re·strict·ive a.
  1. Serving or tending to restrict; limiting; as, a restrictive particle; restrictive laws of trade.
  2. Astringent or styptic in effect. [Obs.]
  --Re*strict*ive*ly, adv. -- Re*strict*ive*ness, n.
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  restrictiveness
       n : modification that makes the meaning more specific (`red hat'
           has a more specific meaning than `hat')