Many of us will remember the great Digital Fact Book that Quantel used to supply us at conventions during the 80s and 90s. It went online in 2015, just at the time that Quantel was bought by Snell.
That great glossary is now published by Snell by arrangement of the broadcast and media industry trade association as the IABM Glossary of Terms.
The link for the Glossary is: IABM Glossary of Terms.
And this is the link for the IABM.