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Biennial means (an event) lasting for two years or occurring every two years. The related term biennium is used in reference to a period of two years. In particular, it can refer to: Biennial plant, a plant which blooms in its second year and then dies
For example, a 10-year flood has a 1/10 = 0.1 or 10% chance of being exceeded in any one year and a 50-year flood has a 0.02 or 2% chance of being exceeded in any one year. This does not mean that a 100-year flood will happen regularly every 100 years, or only once in 100 years. Despite the connotations of the name "return period".
Recurrent event analysis is a branch of survival analysis that analyzes the time until recurrences occur, such as recurrences of traits or diseases. Recurrent events are often analyzed in social sciences and medical studies, for example recurring infections, depressions or cancer recurrences.
12 1 ⁄ 2 years: Parsley: A humorous or mock wedding anniversary celebrated in Northern Germany and the Netherlands, chosen because it is halfway to the silver anniversary. [2] [3] 13 years: Tredecennial: Lace: 14 years: Quattuordecennial: Ivory: 15 years: Quindecennial: Crystal: 16 years: Sexdecennial: Sapphire: Sapphire is separately used ...
[21] [22] According to the World Health Organization, approximately 10 million new TB infections occur every year, and 1.5 million people die from it each year – making it the world's top infectious killer (before COVID-19 pandemic). [21] However, there is a lack of sources which describe major TB epidemics with definite time spans and death ...
For example, United States senators have a six-year term, but they are not all elected at the same time. Rather, elections are held every two years for one-third of Senate seats. Staggered elections have the effect of limiting control of a representative body by the body being represented, but can also minimize the impact of cumulative voting. [1]
The President of the United States is elected to a four-year term. Each of the 435 seats in the United States House of Representatives are elected to two-year terms. The 100 members in the United States Senate are elected to six-year terms, with one-third of them being renewed every two years.
True biennials flower only once, while many perennials will flower every year once mature. The Sweet William Dwarf plant is a biennial plant. Biennials grown for flowers, fruits, or seeds are grown for two years, whereas those grown for edible leaves or roots are harvested after one year—and are not kept a second year to run to seed.