graeme_p - 7:15 am on Nov 30, 2012 (gmt 0)
It has been changed in HTML5:
but it still looks like the official way to mark up definitions.
The issue that bothers me is whether search engines still recognise it due to wide abuse - a lot of designers treat it as a "spare" tag. I notice that some terms on a DL on my site do not appear in a Google definition search, even though they rank well for the same term for an ordinary search.