Google also adds this meaning: noun RARE a person who performs a duty or ceremony. And the etymology they provide says it had that use in the early 1800's

Google also adds this meaning: noun RARE a person who performs a duty or ceremony. And the etymology they provide says it had that use in the early 1800's. It also says the adjective use of the word started in computing in the 1980's. But no word on why dictionaries avoid it. Some people argue it isn't in the dictionary because it's more like jargon. But there are a LOT of jargon words in the dictionary. To me it is interesting that the word has come about "jargonistically" two different times, and with two completely unrelated meanings.