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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A person who attacks and kills victims one by one in a series of incidents.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A person who commits multiple (more than two) murders, especially similar ones with no obvious motive over a period of time with a "cooling-off" period between each murder.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. someone who murders more than three victims one at a time in a relatively short interval


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