This article is from the FAQ, by with numerous contributions by others.
Yes. At the undergraduate level, this normally means at least 12 academic
hours. Graduate level full-time is left to the school to define
(especially since work on a thesis or dissertation may constitute full-time
work even though no credit hours are being taken).
Students may be permitted to pursue part-time study if the foreign student
advisor recommends this for academic reasons (such as the need to improve
English skills) or because of illness.
 
Continue to: