Quadrimester : A unit of time equal to 4 months. Rare in the U.S., this unit is widely used elsewhere to describe an academic term of 4 months duration
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}