To the contrary, not only is it not defined, it's not an operable concept in the act at all. I always thought that the concept of strategic industries or strategic resources was used more in public commentary to ascribe an importance to an economic asset, and I think it makes sense there because it's easy to communicate. But in the context of the act, it doesn't have any grounding in any one of the six factors, so it's not an operable concept in the regime.
On May 21st, 2013. See this statement in context.