Delusionary POS

Every now and then I like to cross-check the meaning of certain words on dictionary.com. Todays word is delusion. Here are the first two explanations of the word delusion on dictionary.com

de·lu·sion [di-loo-zhuhn]
noun
1. an act or instance of deluding.
2. the state of being deluded.
(http://dictionary.reference.com/browse/delusion)

How brilliant! Explaining the meaning of a word by using the same word! That makes me think that dictionary.com is a POS. Now, I know POS is an acronym, and habitually I also like to look up acronymfinder.com, which I promptly do for POS. 79 results returned and closest one to my intent is

*** POS Piece Of Stuff (polite form)
http://www.acronymfinder.com/POS~3.html

That makes me think that acronymfinder.com is also a POS!