Definition of CON

  1. (noun)an argument opposed to a proposal
  2. (noun)a person serving a sentence in a jail or prison
  3. (noun)a swindle in which you cheat at gambling or persuade a person to buy worthless property
  4. (verb)deprive of by deceit
  5. (verb)commit to memory; learn by heart
  6. (adv)in opposition to a proposition, opinion, etc.