[-ISM.] London habits, manners or peculiarities of speech; a word, idiom or pronunciation belonging to the London dialect.
1803. S. Pegge, Anecd. Eng. Lang., 52. The humble and accepted dialect of London, the Londonisms as I may call them.
1857. Blackw. Mag., LXXXI. 316. Their entire Londonism (which is not Cockneyism).
