Etymologically

con

Etymology and origin of the English word con

English has several words spelled con: the verb to study or learn, the adverb against, the verb to steer a ship, and the slang swindle.[1][2][3]

Pronunciation

  • IPA: /kɒn/ (UK); /kɑn/ (US)[4]

con1 study, learn

Confidence
Established
Formation
Inherited
First attested
c. 1425
Inherited from
Old English cunnan via Middle English
Ultimate origin
Old English (cunnan)

Etymology

The verb is inherited from Middle English connen, a variant of cunnen, inherited from Old English cunnan (“to know, know how”) (see can),[1][2][5] with its vowel from the Old English present forms con, can, and partly from the weak Old English cunnian.[3][5]

Earliest recorded meaning

To study or learn by heart: about 1425, in Andrew of Wyntoun's Chronicle, in Barnhart, though conned as a past tense of con thanks, to give thanks, is found by 1325.[1] Hoad notes that it is not clearly separate from cun before the 15th century.[2]

Semantic evolution

The old senses of knowing were taken over by can.[3] Con came to mean to commit to memory and to peruse or scan carefully.[2][6] In northern and Midland dialect it meant to meditate on something in order to learn it.[7]

Timeline

  • 1325 – conned, in con thanks.[1]
  • c. 1425 – to study, memorize.[1]

Modern meaning

Verb

  1. (archaic) To study or examine carefully; to peruse.
  2. To learn or commit to memory.

con2 against

Confidence
Established
Formation
Clipping
First attested
1572
From
Latin contra
Ultimate origin
Latin (contra)

Etymology

The adverb is short for from Latin contrā (“against”) (see contra).[1][8][5]

Earliest recorded meaning

Against a proposition: 1572, originally in pro and con,[1] the 1570s in Etymonline.[8]

Semantic evolution

The noun, a reason or argument against, is from 1589,[1][5] chiefly in pros and cons; it can also mean a person who argues or votes against.[3][6]

Timeline

  • 1572 – pro and con.[1]
  • 1589 – an argument against.[1][5]

Modern meaning

Adverb

  1. In opposition; against.

Noun

  1. An argument or reason against something, chiefly in pros and cons.
  2. A person who holds an opposing view.

con3 steer a ship

Confidence
Established
Formation
Borrowing
First attested
1626
Borrowed from
Old French conduire
Ultimate origin
Latin (conduco)

Etymology

The nautical verb is a reduced form of obsolete cond, from condue,[2][3] borrowed from Old French conduire (“to conduct, guide”),[8][2] from Latin condūcere (“to lead together”) (see conduct).[8][2]

Earliest recorded meaning

To direct the steering of a ship: 1626 in the OED,[9] the 1620s in Etymonline.[8]

Semantic evolution

The noun, the action or post of conning a ship, is from 1825.[8] The conning tower, the armoured pilot house of a warship and later of a submarine, is from 1865.[8][2]

Timeline

  • 1626 – to steer a ship.[9]
  • 1825 – the post of conning.[8]
  • 1865 – conning tower.[8]

Modern meaning

Verb

  1. To direct the steering of a ship.

Noun

  1. The control or post of the person steering a ship.

Word family

  • conning tower

con4 swindle

Confidence
Established
Formation
Clipping
First attested
1889

Etymology

The slang word is short for confidence, in confidence man (1849) or confidence game,[1][8][2] from the many scams in which the victim is persuaded to hand over money as a token of confidence.[8][1]

Earliest recorded meaning

Swindling, in con man: 1889, in American English.[1][8]

Semantic evolution

The verb, to swindle, is from 1896,[1] and con artist is from 1910.[8] The verb has also come to mean to persuade by deceit.[3][10]

Timeline

  • 1849 – confidence man.[8]
  • 1889 – con man.[1][8]
  • 1896 – the verb, to swindle.[1]
  • 1910 – con artist.[8]

Modern meaning

Verb

  1. (informal) To swindle or trick someone, especially after winning their trust.

Noun

  1. (informal) A confidence trick; a swindle.

Word family

  • con man
  • con artist
  • con game

Usage notes

Con is also slang for a convict (1893),[1][3] and short for convention, especially a meeting of science-fiction fans (late 20th century).[3] In mod con it is short for convenience.[3]

References

  1. ^ a b c d e f g h i j k l m n o p q Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  2. ^ a b c d e f g h i Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  3. ^ a b c d e f g h i Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  4. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  5. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  6. ^ a b The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin
  7. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)
  8. ^ a b c d e f g h i j k l m n o p Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  9. ^ a b Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
  10. ^ Collins English Dictionary (2023), Glasgow: HarperCollins

Related etymologies

  • overcome · also from Old English
  • weed · also from Old English
  • stroke · also from Old English
  • pit · also from Old English
  • copper · also from Old English
  • bloody · also from Old English
  • knight · also from Old English
  • tap · also from Old English
Cite this entry

“Con.” Etymologically, 16 Oct. 2026, etymologically.com/en/con. Accessed 16 Oct. 2026.

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