@fiona-smith The dictionaries on here are full of obscure words and a few errors. You might have a look in the Collins dictionary. For instance, about "jedi," it says:

"jedi in British English
NOUN
a person who claims to live according to a philosophy based on that of the fictional Jedi, a caste of wizards in the Star Wars series of films by George Lucas, US film director"
https://www.collinsdictionary.com/dictionary/english/jedi

(I'm amused that it says jedi was popular in the 1700s!)