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From The Collaborative International Dictionary of English v.0.48:
Unconformity \Un`con*form"i*ty\, 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]