[1] : The Collaborative International Dictionary of English v.0.48

unlike \unlike"\, a.
   1. not like; dissimilar; diverse; having no resemblance; as,
      the cases are unlike.
      1913 webster

   2. not likely; improbable; unlikely. obsoles.
      1913 webster

   unlike quantities math., quantities expressed by letters
      which are different or of different powers, as a, b, c,
      a^2, a^3, x^n, and the like.

   unlike signs math., the signs plus + and minus -.
      1913 webster
see also:
unlike quantities 2 3 n unlike signs 

Unlike >> U Words
Unlike, definition of term: Unlike
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Signs >> S Words
Signs, definition of term: Signs
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