The other day I reported on several SEO glossaries at Search Engine Land.
Over the weekend, a new WebmasterWorld thread began a group effort at building out a new SEO dictionary. The list is pretty impressive and is expected to keep growing.
It would be nice if the moderators cleaned it up after the postings settled down a bit and made it a sticky thread.
The dictionary goes from well-known people at Google, to the definition of an authority site, to canonical issues.
Forum discussion at WebmasterWorld.