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.
Related to Fiscal Quarter: fiscal year. One fourth of the calendar that businesses use to calculate revenue and expenses. This may or may not correspond to a calendar quarter. For example, the first calendar quarter includes January, February and March because they are the first three months of the calendar year.