Etymology
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con (n.1, adv.)

"negation; in the negative; the arguments, arguers, or voters against a proposal" (mainly in pro and con), 1570s, short for Latin contra "against" (see contra (prep., adv.)). Compare pro (n.2).

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con (v.3)

"to study, get to know, peruse carefully," c. 1200, cunnen, "make an attempt, try or seek to do," from Old English cunnian "to know" (see can (v.1)). Related: Conned; conning.

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con (adj.)

"swindling," 1889 (in con man), American English, from confidence man (1849), from the many scams in which the victim is induced to hand over money as a token of confidence. Confidence with a sense of "assurance based on insufficient grounds" dates from 1590s. Con artist is attested by 1910.

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con (v.1)

"to guide a ship, give orders for the steering of a ship," 1620s, from French conduire "to conduct, lead, guide" (10c.), from Latin conducere  "to lead or bring together, contribute, serve," from com "with, together" (see com-) + ducere "to lead" (from PIE root *deuk- "to lead"). As a noun, "action or post of steering a ship," 1825. Related: Conned; conning. Conning tower "dome-shaped pilot house of an ironclad warship or submarine" is attested from 1865.

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con (v.2)
"to swindle," 1896, from con (adj.). Related: Conned; conning.
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con (n.2)

a slang or colloquial shortening of various nouns beginning in con-, such as, from the 19th century, confidant, conundrum, conformist, convict, contract, and from the 20th century, conductor, conservative.

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con- 

word-forming element meaning "together, with," sometimes merely intensive; it is the form of com- used in Latin before consonants except -b-, -p-, -l-, -m-, or -r-. In native English formations (such as costar), co- tends to be used where Latin would use con-.

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nem. con. 

abbreviation of Latin phrase nemine contradicente "no one dissenting," hence, "without opposition." From ablative of nemo "nobody" + ablative present participle of contradicere.

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consilience (n.)

1840, "concurrence, coincidence," literally "a jumping together," formed on model of resilience from Latin consilient-, from assimilated form of com "with, together" (see con-) + salire "to leap" (see salient (adj.)).

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consanguineous (adj.)

"of the same blood, related by birth," c. 1600, from Latin consanguineus "of the same blood," from assimilated form of com "with, together" (see con-) + sanguineus "of blood" (see sanguinary).

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