If High Definition is defined as a telivision standard, then I'd guess that to be considered high def you'd need to be at 720p or greater AND have a 16:9 aspect ratio.
Practically, it probably has to be 720p or 1080i/p. What resolutions is the content being brought to you in? As far I'm concerned, that is the only thing that matters, and probably is the ultimate practical indication of what is HD.
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If High Definition is defined as a telivision standard, then I'd guess that to be considered high def you'd need to be at 720p or greater AND have a 16:9 aspect ratio.
Practically, it probably has to be 720p or 1080i/p. What resolutions is the content being brought to you in? As far I'm concerned, that is the only thing that matters, and probably is the ultimate practical indication of what is HD.