Definition of "whit"

Star. I believe we must leave the killing out, when all is done.Bot. Not a whit: I have a device to make all well.

c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene ii]

Now I was eight and very small, / And he was no whit bigger / And so I smiled, but he poked out / His tongue, and called me, 'Nigger.'

1917, Countee Cullen, Incident

In conclusion, I would remark that the great railway stations of London deserve to be visited every whit as much as St. Paul's Cathedral, the Abbey, or the Tower, and they are as worthy a memento of this century as those buildings are of the days that are gone.

1944 July and August, “London Railway Stations in 1893”, in Railway Magazine, page 201, taken from The English Illustrated Magazine of June 1893