In terms of SEO, I would define it as an established site trusted by Google. You can usually know if it's an authority site based on how easily it ranks in the SERPs.

Use search button. It was discussed many times.

look here (use advanced search "Search Titles Only"):
http://www.warriorforum.com/adsense-...rity-site.html
http://www.warriorforum.com/adsense-...rity-site.html
http://www.warriorforum.com/adsense-...rity-site.html

Authority sites are basically "Hubs" that branch out into many different pages or articles that are all based on different sub-groups, but pertain to the same overall topic. For example, an authority site on weightlifting will have the general topic of health and fitness, but it will then offer links to other pages featuring specific subjects like weight loss, muscle gain, etc.

Hope this helps!

Chase

Thanks Everyone

Not Sure Why I couldnt Find those when I searched but that was exactly what I was looking for..

When you search "Search Entire Posts" (default), you get useless results, better to use "Search Titles Only".

I would say an "authority Site" is a website that is ranked high in Google search Engine Ranking based upon several criteria like quality of content, usability and the amount of traffic to the website. If you search in google for a a keyword you will see these authority websites on the first page.

LOL @ all th3 answ3rs abov.

An authority site is a site that has authority. What this means, at least to me, is that these websites are the "go-to source" for people in that niche, and that a lot of people look upon them as authoritative. Say you want to learn Internet marketing; a authority site would be WarriorForum.com because everyone knows there's a lot of good information here (even if there's more trash than quality content).

An Authority site can also come into being when it becomes popular, with thousands of links to it being created by people constantly visiting it, telling other people about it, so that becomes a "must go site" for people on a regular basis.

As I remember, someone wrote that PerezHilton.com is an authority site because its ranking is based on content and trafic. This is a rather arbitrary meaning of "authority" but perhaps relevant to internet marketing.

Not sure how easy it is to make a site rank based on expert content, but i get some nice juicy links from a science site, that helps balance all the shitty spamlinks that I also have.