define Keyword Density

Definition:

An old measure of search engine relevancy based on how prominent keywords appeared within the content of a page. Keyword density is no longer a valid measure of relevancy over a broad open search index though.

The old definition was the number of times a keyword or keyword phrase is used in the body of a page. This is a percentage value determined by the number of words on the page, as opposed to the number of times the specific keyword appears within it. In general, the higher the number of times a keyword appears in a page, the higher its density.