I could be wrong but I don't know if there is a glossary on here. If there is it will be a sticky somewhere. If you google polyamory though you'll come across xeromag and he has a good one on his site.
Jealousy is a very funny beast. My relationship has been poly/mono (only my partner has had a secondary), so I had a lot of jealousy to work through. Now I'm spreading my wings and he is getting a bit insecure (not so much jealous), but then there is still no actual person for him to be jealous of. I think when/if the time comes he will have to learn to cope with jealousy.Do a tag search for jealousy if it's really bothering you.
My partner has been away with his OSO (other significant other) this weekend. I've done really well in terms 0f jealousy, even feeling some compersion. Last night a little jealousy came up; it was around a boundary that we had both forgotten about. In the end I decided I was being self-centred and was determined to let it go. Still I didn't sleep well. Sometimes you just have to say to yourself ...AND THIS TOO WILL PASS.