Supplemental Result

how is it defined?

[starec]

Apologies if this has been covered already.

It's the first time I see some results marked as "Supplemental Result" in SERPs.

It may have something to do with duplicate/very similar content from what I see from my limited sample.

How common is it?

[mcavic]

This has been discussed, but I don't think it's been precisely defined. I don't think it has anything to do with duplicate/similar content.

[webmasterworld.com...]

[rfgdxm1]

The one thing I have been able to correlate with a page being a Supplemental Result is if it is an orphan. Google still checks on these pages, even though regular crawling misses them.

[mcavic]

Yep, I agree. What I gathered from GG's statements is "they are considered to be less relevant, but possibly helpful in cases where a search doesn't return very many other results." Orphans would fit that description.

[g1smd]

I made some pages into supplemental results by amending the content of some pages then searching Google for the old content a few days later. The pages were listed under their old search terms and with old snippets and with supplemental result appended, whilst searching for the new content showed that the pages had already been indexed for the new content, and had new snippets too.