Webster 1913 Edition
Not common; unusual; infrequent; rare; hence, remarkable; strange;
uncommondegree of cold or heat;
Syn. – Rare; scarce; infrequent; unwonted.–
Webster 1828 Edition
1.Not common; not usual; rare; as an uncommon season; an uncommon degree of cold or heat; uncommon courage.
2.Not frequent; not often seen or known; as an uncommon production.