Guitar Nine Records Glossary of Terms
Buzzwords, jargon and terms used in recording studios by producers, engineers, composers and musicians.
http://www.guitar9.com/glossary.html

CCTV Glossary
Glossary of closed-circuit television, general video and graphics terminology.
http://www.zoo.co.uk/~z0001325/Glossary.html

Digital Film Glossary
Glossary of photographic and digital imaging terminology with illustrations.
http://www.digitalexposure.ca/sub1.html

Hi Fi Writer - Dictionary of Home Entertainment
Terms defined as well as given an "everyday usage" context.
http://www.hifi-writer.com/he/dictionary.htm

Kodak Film and Video Terminology
Glossary of common terms used in film and video production.
http://www.kodak.com/US/en/motion/students/support/glossary/glossary.jhtml

Music Technology Dictionary
Regularly updated dictionary from zonicweb.net.
http://zonicweb.net/music/musictechnologydictionary.htm

DigicamGuides.com
Camera and digital camera terms.
http://www.digicamguides.com/learn/digital-camera-terms.html