Definition of "uncommon"

This is not an uncommon practice.

1946 January and February, “The Why and The Wherefore: The Forth Bridge”, in Railway Magazine, page 59

‘Is Suffolk your county, sir?’ asked William.‘Yes,’ I said, with some importance. ‘Suffolk’s my county.’‘I’m told the dumplings is uncommon fine down there,’ said William.

1849 May – 1850 November, Charles Dickens, The Personal History of David Copperfield, London: Bradbury & Evans, […], published 1850

'The Squire's pretty springe, considering his weight,' said Mr Macey, 'and he stamps uncommon well.'

1861, George Eliot, Silas Marner, London: Penguin Books, published 1967, page 159