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con 1 (kŏn)
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adv.
In opposition or disagreement; against: debated the issue pro and con.
n.
1. An argument or opinion against something.
2. One who holds an opposing opinion or view.

[Short for CONTRA.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
con  2 (kŏn)
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tr.v. conned, con·ning, cons
Archaic
1. To study, peruse, or examine carefully.
2. To learn or commit to memory.

[Middle English connen, to know, from Old English cunnan; see gnō- in the Appendix of Indo-European roots.]

conner n.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
con 3 or conn (kŏn) Nautical
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tr.v. conned, con·ning, cons or conns
To direct the steering or course of (a vessel).
n.
1. The area or structure on a vessel from which the vessel is conned.
2. The position or authority of the officer conning a vessel.

[From cond, from Middle English conduen, from Old French conduire, from Latin condūcere, to lead together; see CONDUCE.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
con 4 (kŏn) Informal
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tr.v. conned, con·ning, cons
1. To swindle (a victim) by first winning the victim's confidence; dupe: a criminal who conned an unsuspecting tourist out of $5,000.
2. To cause (someone) to do something by lying, misrepresentation, or trickery: My roommate conned me into washing the dishes.
n.
A swindle.
adj.
Of, relating to, or involving a swindle or fraud: a con artist; a con job.

[Short for CONFIDENCE.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
con 5 (kŏn)
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n.
Slang
A convict.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
con-
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pref.
Variant of com-.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
con.
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abbr.
1. concerto
2. Latin conjunx (wife)
3. consolidate
4. Con. consul
5. continued

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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