Ultraviolet index. The ultraviolet index or UV Index is an international standard measurement of the strength of sunburn-producing ultraviolet (UV) radiation at a particular place and time. The scale was developed by Canadian scientists in 1992, then adopted and standardized by the UN's World Health Organization and World Meteorological Organization in 1994.
one-quarter-one of four equal parts; a quarter of a pound. fourth part, one-fourth, quarter, quartern, twenty-five percent, fourth. common fraction, simple fraction-the quotient of two integers.
A trimester system is essentially a year-round semester system. They hold two semesters during the normal academic year and a third semester during the summer. The CSUDH HUX program is a trimester program. A quarter system usually holds three quarters in roughly the same time as two semesters. They may or may not hold a summer quarter as well.