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

unconformity \un`conform"ity\, n.
   1. want of conformity; incongruity; inconsistency. --south.
      1913 webster

   2. geol. want of parallelism between strata in contact.
      1913 webster

   note: with some authors unconformity is equivalent to
         unconformability; but it is often used more broadly,
         for example, to include the case when the parallelism
         of strata once conformable has been disturbed by
         faulting and the like.
         1913 webster

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Unconformity, definition of term: Unconformity
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