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APCO 10-code for "I understand your transmission"
Fairfax to car 459, we've got a 10-50 on 95 south of exit 150

by IrishRepublicanArmy May 24, 2004
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10-4 means "OK," "understood," and "affirmative." Commonly known as CB radio lingo, originating from the need for brevity in radio transmission.
me--"Is anyone there?"
respondent--" 10-4"(to indicate presence).

me--"Let's roll."
respondent--"10-4"(to indicate agreement).
by Mis2y September 21, 2006
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A term used in police pursuits meaning, "Understood".
"Attention all patrolling units, we have had numerous reports of a high speed street racer on the 192 East."
"Uh, have you got any more info on this call?"
"Driver is currently in a black Atom 500."
"10-4, copy that. I'll be on the lookout for this guy."
by Mitcho2001 January 19, 2016
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This is Romeo 1 to all units we have got 3 vehicles sighted at Heroin Processing, Over.
This is Kilo 2 10-4 On last, responding now, over.
by Legpain August 27, 2017
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Means Ten Four
Actnollegment of a statement
That was a nice shot!

10 4
by b December 11, 2003
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A term for the semi-canon slash relationship between Watanuki Kimihiro and Doumeki Shizuka in CLAMP's xxxHolic manga/anime. It is derived from the combination of the first two kanji in the characters' names: "hyaku" or "dou" (100) for Doumeki, and "shi", or "yon" (4; neither of the normal readings are used in Watanuki's name) for his love interest. Because the xxxHolic fandom is not large, and eventual 104 is (very) strongly implied in the plot, the terms are pretty much ubiquitous. 104 is also called donuts.
It's been a while since I worked on any 104 fanfic...
by DouWataAddict August 21, 2007
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