Webster's English Dictionary

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resistance

re.sis.tance \ri-'zis-t*n(t)s\ n 1a: an act or instance of resisting : 
   OPPOSITION  1b: a means of resisting  2: the ability to resist  3: an 
   opposing or retarding force  4a: the opposition offered by a body or 
   substance to the passage through it  of a steady electric current 4b: a 
   source of resistance  often cap  5: an underground organization of a 
   conquered country engaging in sabotage  and secret operations against 
   occupation forces and collaborators