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I'm actually not sure if the algorithm considers all the content on the domain when assessing the relevance of a particular page. But it sounds like you WILL have a lot of topically relevant pages, no? Your site is about widgets; you have a couple of pages that are optimized for big terms like "buy widgets," "women's widgets," etc.; then you have lots of other pages that will still mention widgets in some capacity, right? It's not like you have a travel booking website and now you're trying to optimize one page for viagra?