You've probably meant keyword prominence, I've never heard of body prominence.
Keyword prominence is a measure of keyword importance that indicates how close a keyword is to the beginning of the analyzed page area.
If some word is used at the beginning of the title, headings, or close to the beginning of the visible text of the page, it is considered more important than other words.
Prominence is calculated separately for each important page area. HTML markup lets you emphasize certain document areas against the others. The most important items are placed at the top, and their importance is gradually reduced towards the bottom.
Keyword prominence works much the same way. Usually, the closer a keyword to the top of a page and to the beginning of a sentence, the higher its prominence is. However, search engines also check if the keyword is present in the middle and at the bottom of the page, and you should be aware of that.
100% prominence is given to a keyword or keyphrase that appears at the beginning of the analyzed page area. The keyword/keyphrase in the middle of the analyzed area will have 50% prominence.
I hope this helps 
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