In that most folk are saying that meta tags no longer count for much, your question could be simply an academic one.
However, I do agree with cbp and janeth that every page should stand on its own right and at least have title and description metatags that relate to its specific content.
Maybe you could, without any real harm, use the same keyword metatags throughout your site, but even here I think you'd be further ahead with some variation from page to page.
Duncan
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