con

1
[ kon ]
/ kɒn /

adverb

against a proposition, opinion, etc.: arguments pro and con.

noun

the argument, position, arguer, or voter against something: The pros of the library project are obvious, but we have to consider the cons as well.

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Compare pro1.

Origin of con

1
First recorded in 1575–85; short for Latin contrā “in opposition, against”

Definition for con (2 of 10)

con2
[ kon ]
/ kɒn /

verb (used with object), conned, con·ning.

to learn; study; peruse or examine carefully: She's been conning her grandfather's medical diaries for months.
to commit to memory: I have conned the state capitals in alphabetical order, from Albany to Trenton.

Origin of con

2
First recorded before 1000; Middle English cunnen, Old English cunnan, variant of can1 in sense “become acquainted with, learn to know”

Definition for con (3 of 10)

con3

or conn

[ kon ]
/ kɒn /
Nautical

verb (used with object), conned, con·ning.

to direct the steering of (a ship): conning the freighter into port.

noun

the station of the person who cons: You will assume the con, ensign.
the act of conning: Storms from the northeast made for a difficult con.

Origin of con

3
First recorded in 1350–1400; earlier cond, apocopated variant of Middle English condie, condue, from Middle French cond(u)ire, from Latin condūcere “to conduct”

Definition for con (4 of 10)

con4
[ kon ]
/ kɒn /
Informal.

verb (used with object), conned, con·ning.

to swindle; trick: That crook conned me out of all my savings.
to persuade by deception, cajolery, etc.: Don't worry, I can always con my dad into letting me use his car.

noun

a confidence game or swindle: By the time my uncle realized she was playing a con on him, she had already left town with his rare coin collection.
a lie, exaggeration, or glib self-serving talk: He had a dozen different cons for getting out of paying traffic tickets.

adjective

relating to or involving abuse of confidence: a slick con man;a con trick.

Origin of con

4
An Americanism first recorded in 1895–1900; by shortening of confidence

Definition for con (5 of 10)

con5
[ kon ]
/ kɒn /

noun Informal.

a convention, especially one for fans of a particular type of popular culture: sci-fi, gaming, and anime cons.

Origin of con

5
First recorded in 1940–45; by shortening

Definition for con (6 of 10)

con6
[ kon ]
/ kɒn /

noun Slang.

a convict: Her brother's a con up in Elmira.

Origin of con

6
First recorded in 1715–25; by shortening

Definition for con (7 of 10)

con7
[ kon ]
/ kɒn /

verb (used with object), conned, con·ning.British Dialect.

to strike, hit, or rap (something or someone): We think he was conned with a cricket bat.
to hammer (a nail or peg): Who knew conning tacks into the new carpet would take so long?
to beat or thrash (a person) with the hands or a weapon: He conned the poor guy in the pub for no apparent reason.

Origin of con

7
First recorded in 1890–95; perhaps akin to French cognée “hatchet,” cogner “to knock in, drive (a nail) home”

Definition for con (8 of 10)

con-

variant of com- before a consonant (except b, h, l, p, r) and, by assimilation, before n: convene; condone; connection.

Origin of con-

From Latin

Definition for con (9 of 10)

con.

Origin of con.

From the Latin word contrā

Definition for con (10 of 10)

Con.

Conformist.
Consul.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for con (1 of 8)

con1
/ (kɒn) informal /

noun

  1. short for confidence trick
  2. (as modifier)con man

verb cons, conning or conned

(tr) to swindle or defraud

Word Origin for con

C19: from confidence

British Dictionary definitions for con (2 of 8)

con2
/ (kɒn) /

noun (usually plural)

an argument or vote against a proposal, motion, etc
a person who argues or votes against a proposal, motion, etc
Compare pro 1See also pros and cons

Word Origin for con

from Latin contrā against, opposed to

British Dictionary definitions for con (3 of 8)

con3
/ (kɒn) /

noun

slang short for convict

British Dictionary definitions for con (4 of 8)

con4

esp US conn

nautical

verb cons, conns, conning or conned

(tr) to direct the steering of (a vessel)

noun

the place where a person who cons a vessel is stationed

Word Origin for con

C17 cun, from earlier condien to guide, from Old French conduire, from Latin condūcere; see conduct

British Dictionary definitions for con (5 of 8)

con5
/ (kɒn) /

verb cons, conning or conned

(tr) archaic to study attentively or learn (esp in the phrase con by rote)

Word Origin for con

C15: variant of can 1 in the sense: to come to know

British Dictionary definitions for con (6 of 8)

con6
/ (kɒn) /

preposition

music with

Word Origin for con

Italian

British Dictionary definitions for con (7 of 8)

con-

prefix

a variant of com-

British Dictionary definitions for con (8 of 8)

Con.

abbreviation for

Conservative
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for con

con-

pref.

Variant ofcom-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.