con1 / kän/ inf. • v. (conned , con·ning ) [tr.] persuade (someone) to do or believe something, typically by use of a deception: she was jailed for conning her aunt out of $500,000. • n. an instance of deceiving or tricking someone: when depositors, realizing that the whole thing is a con, demand repayment | [as adj.] a con artist. con2 • n. a disadvantage: weigh up the pros and cons. con3 • n. inf. a convict. con4 • variant spelling of conn. con5 • v. (conned , con·ning ) [tr.] archaic study attentively or learn by heart (a piece of writing). con6 • n. inf. a convention, esp. one for science-fiction enthusiasts.
A prefix meaning with or together. A slang abbreviation for confidence, as in con man or con game. To con someone is to deceive or take advantage of a person throughfraudor trickery after winning the person's confidence. Con is also used as a slang abbreviation for convict, as in ex-con to mean someone previously incarcerated. An abbreviation for contra, which means against. To show the pros and cons of a particular issue means to present arguments or evidence on both sides.