What is the Certified Pool/Spa OperatorÂ® Certification Program? A CPOÂ® Certification provides individuals with the basic knowledge, techniques, and skills of pool and spa operations. This training has helped protect millions of swimmers by reducing hazards at aquatic facilities.
A year is the orbital period of the Earth moving in its orbit around the Sun. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by changes in weather, the hours of daylight, and, consequently, vegetation and soil fertility.
Full Definition of DECADE. 1. : a group or set of 10: as a: a period of 10 years b: a division of the rosary that consists primarily of 10 Hail Marys. 2. : a ratio of 10 to 1: order of magnitude. The war lasted nearly a decade. 2  The bridge was built a decade ago. 3  The decade of the 1920s runs from January 1, 1920 to December 31, 1929. 4  the first decade of the 21st century.