Supper in the Regency

Like her father, Mr Woodhouse, Mrs John Knightley
liked a basin of gruel for supper, but her cook
was unable to make anything tolerable
from Emma by Jane Austen
1896 edition illustrated by Hugh Thomson
What was supper in the Regency period?

I use the word supper interchangeably with dinner to mean my main evening meal. But if we have an early dinner, my hungry husband is sometimes looking for a bite of supper before he goes to bed! It is this latter use of the word that is more akin to what a R...