<p>I found that UIC had the best definition of "international applicant". According to their office of admissions:</p>
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An international applicant is a person who is a citizen or permanent resident of a country or political area other than the United States and who has a residence outside the United States to which he or she expects to return, and either is, or proposes to be, a temporary alien in the United States for educational purposes.
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<p><a href="http://www.uic.edu/ucat/catalog/AR.shtml#j%5B/url%5D">http://www.uic.edu/ucat/catalog/AR.shtml#j</a></p>
<p>If this same definition applies to MD/PhD programs, it would depend on whether or not you plan on returning to Canada after you finish your studies.</p>