1. 
[syn: intensifier, intensive]
The Collaborative International Dictionary of English v.0.48:
Intensifier \In*ten"si*fi`er\, n.
   One who or that which intensifies or strengthens; in
   photography, an agent used to intensify the lights or shadows
   of a picture.
   [1913 Webster]
WordNet (r) 3.0 (2006):
intensifier
    n 1: a modifier that has little meaning except to intensify the
         meaning it modifies; "`up' in `finished up' is an
         intensifier"; "`honestly' in `I honestly don't know' is an
         intensifier" [syn: intensifier, intensive]