I've been using the "standard poly definitions" of jealousy vs envy for quite some time:
jealousy = fear of losing something you have
envy = wanting what someone else has
But I just found an old forum post
where someone dragged up a dictionary definition. Usually I pooh-pooh dictionary definitions when applied to poly stuffs... but in this case, I felt like reopening a discussion on it, since "jealousy" is a common human emotion and it's helpful if everyone means the same thing when they use those words.
(similar to m-w also)
Wikipedia, however, seems to use the poly-definitions:
thesaurus.com has this interesting note: "jealousy is reflective of a person's feelings or attitudes toward another person, whereas envy expresses a person's feelings or attitudes toward another person's advantages or accomplishments; jealousy pertains to emotional rivalry while envy is resentment of a more fortunate person"
And that's really more in-line with what I understood to be the difference before I started reading up on poly stuffs.
envy = Mmm, that guy has ice cream. I wish I had ice cream.
jealousy = That bitch has ice cream.
fear of loss = That dog is eying up my ice cream, I think he's going to try and steal it.
insecurity = I don't deserve this ice cream and I sure hope no one catches on or else they'll take my ice cream.
While I fully agree that jealousy usually stems from insecurity or a fear of loss rather than simply wanting what someone else has and hating them for it.. I think I no longer agree that they're one and the same thing...