what's keywords density mean?

please help to explain this example

[wnshops]

so when we are talking about keywords density we are talking about two words that go together example.
1, webmaster world.
2, world webmaster,
3,webmaster 1223 world.
4,world 1233 webmaster.
5, webmaster 1111 00000 world
6, world 1222 11111 webmaster.

Please tell me which is the most keywords density?
please start with the number order.
Thanks

[sidyadav]

A keyword density analyser/calculator calculates the number of occurrences of a given keyword in a supplied web page.

Depends on which one you're using, there are a lot of them [google.com] available throughout the web - almost on every information/SEO website.

Sid

[Marcia]

When you're talking about keyword density, it's a percentage representing the number of times a keyword appears on a page relative to the total number of words on the page altogether.

Two words together would be a phrase, and the concept is the same, also a percentage representing the number of times the phrase appears on the page relative to the number of identified two-word phrases on the page altogether.

The percentage figures will he different for the two words together and each of them individually. Same thing with three and four word keyword phrases.