The following words and terms, when used in this subchapter, shall have the following meanings, unless the context clearly indicates otherwise:(1) Board--The Texas Higher Education Coordinating Board.(2) Citizen of Mexico--A citizen or permanent resident of Mexico who resides in Mexico and who plans to return to Mexico to live immediately after finishing his/her educational program.(3) Commissioner--The commissioner of higher education, the chief executive officer of the board.(4) Full-time Enrollment--For undergraduates, enrollment for the equivalent of at least 12 semester credit hours per semester. For graduates, enrollment for the equivalent of at least 9 semester credit hours per semester.