Catastrophe definition, a sudden and widespread disaster: the catastrophe of war. See more.
1 Total Time: The computer-delivered GRE takes 3 hours and 45 minutes for the average student.  Experts recommend sitting for the GRE exam one year prior to entering graduate school. This allows for ample study time and the option to retake it if desired.
DEFINITION of 'Graduate Record Examination-GRE'. A standardized exam used to measure one's aptitude for abstract thinking in the areas of analytical writing, mathematics and vocabulary. The GRE is commonly used by many graduate schools to determine an applicant's eligibility for the program. The GRE is only offered via computer, however in areas which lack the appropriate computer networks, a paper-based exam may be given. Next Up.