I’ve previously published The Best Guides To ESL/EFL/ELL Terminology.
I also have links to many multilingual student glossaries at The Best Multilingual & Bilingual Sites For Math, Social Studies, & Science. You can find other useful student glossaries at The Best Websites For Developing Academic English Skills & Vocabulary and The Best Art Websites For Learning English.
In addition, over the years, I’ve published several links to other education-related glossaries, but never got around to putting them all in one place.
I’m doing it here, and let me know if I’ve missed any:
Ed Shelf has an ed Tech dictionary.
Richard Byrne has created a free Glossary of Blogging Terminology.
The U.S. Department of Education has published a glossary of education research terms (on page nine).
Gaming Glossary: Game-based Learning v. Gamification is from ELT Sandbox.
a comprehensive online resource that describes widely used school-improvement terms, concepts, and strategies for journalists, parents, and community members.
Poynter Online published Digital Journalist Survival Guide: A Glossary of Tech Terms You Should Know. Even though it’s targeting journalists, the glossary would be helpful to anyone.
Glossary of Education Related Terms is from Wikipedia.
Glossary of Education Terms is from Ed Source.
A Glossary for the Current Education Debate is from Edutopia.