>><dl>
>>
>>    <definition>
>>
>><dt>My term</dt>
>>
>>            <dd>This is the a definition</dd>
>>
>><dd>This is the another definition</dd>
>>
>>      </definition>
>>
>></dl>
>>

Hmm, I think I would have to disagree. Consider:

    <table>
       <tr>
          <th>Heading 1</th>
          <th>Heading 2</th>
       <tr>
          <td>Content 1</td>
          <td>Content 2</td>
       </tr>
    </table>

Here there is no markup creating semantical correlation between either 
Heading 1 and Content 1 or Heading 2 and Content 2 but they are clearly 
meant to be related.

Whenever deciding issues of semantics I always imagine I am blind and 
how a speech reader might describe things to me. For the above 
definition list (minus the <definition/> element), I imagine it might 
describe it as follows:

    "Definition list. First term is: My term. First term, first 
definition: This is the a definition. First term, second definition: 
This is the another definition."

Or something similar. Structuring the markup in a logical order should 
remove any confusion in my opinion.

-Andy