QUOTE(indian yellow pages @ Jun 14 2013, 01:05 PM)
Keyword Density is proportional measurement of keywords in any particular website webpage. It is between 3 to 5 percent in any webpage.
Keyword density is a combination of the number of times a keyword or a keyword phrase, in proportion with other words, appears on a Web page. The more times the keyword appears in relation to the total number of on page words, the greater the overall keyword density. The more times that other words appear, the lower the proportion of keywords, resulting in a lighter keyword density.