What is the meaning of [Good riddance]

An expression of pleasure on being rid of some annoyance – usually an individual.

‘Riddance’ is now so completely associated with this little phrase that it is rarely, if ever, seen out alone. The only sort of riddance on offer these days is a good one. It wasn’t always thus. In the 16th century a riddance was a general-purpose noun and meant ‘deliverance from’ or ‘getting rid of’. The first adjectives to be linked with the word were fayre/happy/gladsome and, in Shakespeare’s Merchant of Venice, 1600, Portia wishes the Prince of Morocco ‘a gentle riddance’.

A very early use of riddance comes in John Rastell’s poem, Away Mourning, circa 1525:

I haue her lost,
For all my cost,
Yet for all that I trowe
I haue perchaunce,
A fayre ryddaunce,
And am quyt of a shrew.