What does 'RD' mean?

<p>Like in the title of this thread: <a href="http://talk.collegeconfidential.com/showthread.php?t=46638%5B/url%5D"&gt;http://talk.collegeconfidential.com/showthread.php?t=46638&lt;/a&gt;&lt;/p>

<p>regular decision</p>

<p>I can't believe I overlooked that. Thanks!</p>