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From The Collaborative International Dictionary of English v.0.48:
Unconformability \Un`con*form`a*bil"i*ty\, n. 1. The quality or state of being unconformable; unconformableness. [1913 Webster] 2. (Geol.) Lack of parallelism between one series of strata and another, especially when due to a disturbance of the position of the earlier strata before the latter were deposited. [1913 Webster]