mod. no; negative. Q: Are you going to leave now? A: Negatory. :
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
negatory (adj.)
"expressing negation," 1580, from M.Fr. negatoire, from M.L. negatorius "negative," from L. negatus (see negation). In the sense "no" it is U.S. Air Force slang from the early 1950s.