Some of those pre-date Regency era or also had more general meaning, like Wikipedia writes in the article on the Biblical Abigail:
Quote:
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Abigail's self-styling as a handmaid led to Abigail being a traditional term for a waiting-woman, for example as the waiting gentlewoman in Beaumont and Fletcher's The Scornful Lady, published in 1616. Jonathan Swift and Henry Fielding use Abigail in this generic sense, as does Charlotte Brontė.
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I've read that in other non-Regency setting books. I'm nearly sure it's in the Children of the Abbey* by the Irish novelist Regina Maria Roche published in 1796.
I started reading the books mentioned Northanger Abbey and their "Gothic" predecessors.
Corinthian also probably predates Regency era and by the the Victorian era meant a sporting man, loads of Victorian era origin clubs have Corinthian in the name.
Some aspects seem like proto-rhyming slang, the Cockey kind starting 100 years later in mid 19th C.
Other words seem to be from soldiers and the Napoleonic wars.
Ape-leader for spinster is certainly real Regency.
Beau Brummell was real and resulted in Dandies and Macaronis and Slang.
See
https://en.wikipedia.org/wiki/Dandy
The
ton was also a real term.
Perhaps Heyer was a little given to overplaying her hand on Regency Cant or Slang, but I think she didn't knowing make it up. Of course she is more imitated than the real Regency Era writers. The Era is really more than the time of the actual Regency.
Queen Victoria lived 24 May 1819 to 22 January 1901 and became Queen in 1837, but the Cultural, Empire and Technological era is from a little before her birth till WWI. Volta published about batteries and Electricity in 1800, Frankenstein or The Modern Prometheus by Mary Shelly in 1816 uses the aspect of Electricity debunked by Volta in 1799 and in the 1840s and 1850s it was cheaper to see the play than buy the book. The British Empire peaked in 1921. So though the actual Regency was only 1811 to 1820, the overall era is taken as 1795 to 1837, or 1795 to 1820.
Heyer did some Georgian, pre-Regency style stories.
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* Children of the Abbey is mentioned in Emma by Austin.