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reflex   n 
1 
a an immediate involuntary response, esp. one that is innate, such as coughing or removal of the hand from a hot surface, evoked by a given stimulus 
b (as modifier) 
a reflex action   See also  →  reflex arc 
2 
a a mechanical response to a particular situation, involving no conscious decision 
b (as modifier) 
a reflex response  
3 a reflection; an image produced by or as if by reflection 
4 a speech element derived from a corresponding form in an earlier state of the language 
``sorrow'' is a reflex of Middle English ``sorwe.''  
  adj 
5  (Maths) (of an angle) between 180° and 360° 
6 turned, reflected, or bent backwards  vb 
7 to bend, turn, or reflect backwards 
 (C16: from Latin reflexus bent back, from reflectere to reflect) 
♦  reflexible  adj 
♦  reflexibility  n