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Preaching with a whining, affected tone, perhaps a corruption of chaunting; some derive it from Andrew Cant, a famous Scotch preacher, who used that whining manner of expression. Also a kind of gibberish used by thieves and gypsies, called likewise pedlar’s French, the slang, &c. &c.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
See also the definition in Nathan Bailey's 1736 dictionary of canting and thieving slang.
Canticle * CantersNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes
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Francis Grose was independently wealthy, having inherited money from his father, a jeweller. Finding himself overspending, he published a number of books; his Provincial Glossary seems to have been the starting-point for the Vulgar Tongue reproduced here.