Do not use keywords in meta tags if the keyword is not in the single page body text.

Ignore the hype about “secret” keywords in meta tags – including all possible keywords in a meta tag will hurt more than it helps. The simplest and most effective way of ensuring a solid web site ranking is to use the keywords that are in the body text in the meta tag, and vice versa. If there is a keyword not in the body text that you feel you must use in the meta tags, then insert it into the visible page text.