Definition of con noun from the Oxford Advanced Learner's Dictionary

     

    con

     noun
    noun
    BrE BrE//kɒn//
     
    ; NAmE NAmE//kɑːn//
     
    (informal)
     
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  1. 1[singular] (also British English, formal confidence trick) (also North American English, formal confidence game) a trick; an act of cheating somebody The so-called bargain was just a big con! (British English) a con trick (North American English) a con game He's a real con artist (= a person who regularly cheats others). see also conman, mod cons
  2. 2[countable] = convict
  3. Word Originnoun sense 1 late 19th cent. (originally US): abbreviation of confidence, as in confidence trick. noun sense 2 late 19th cent.: abbreviation.Extra examples The scheme was all a big con. He’s a real con artist. It was all one big con trick. Look, I’m an officer, and cons don’t speak to me like that, okay? The so-called bargain was just a con!Idioms the advantages and disadvantages of something We weighed up the pros and cons.
See the Oxford Advanced American Dictionary entry: con