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.
Princeton's WordNet(2.50 / 2 votes)Rate this definition: 1  annual(noun) (botany) a plant that completes its entire life cycle within the space of a year. 2  annual, yearly, yearbook(adj) a reference book that is published regularly once every year. 3  annual, one-year(adj) completing its life cycle within a year.