Definitions for uncommonness
Random House Webster's College Dictionary
un•com•monʌnˈkɒm ən(adj.)-er, -est.
not common; unusual; rare.
more than the usual in amount or degree.
Origin of uncommon:
extraordinariness as a consequence of being marked by an uncommon or superlative quality
extraordinariness as a consequence of being rare and seldom encountered
The state or quality of being uncommon.
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