An example is the Mesozoic era, when dinosaurs lived on the Earth.

It describes a long series of rock strata which geologists decide should be given a name. How long is a era?Īn era in geology is a time of several hundred million years.

The word millennium derives from the Latin mille, thousand, and annus, year. Millennia sometimes have religious or theological implications (see millenarianism). Who is a millennia?Ī millennium (plural millennia or millenniums) is a period of one thousand years, sometimes called a kiloannum (ka), or kiloyear (ky). Both are just really long periods of time, but in science an eon is about a billion years. You might be interested: FAQ: What does bid mean in medical terms? How long is a eon?Įon goes back to the Greek aiōn, “age.” An age is not easy to measure, and neither is an eon. No universally used singular form in modern English of “ cattle” exists, other than the sex- and age-specific terms such as cow, bull, steer and heifer. Thus one may refer to “three cattle” or “some cattle“, but not “one cattle“. um | ə-ˈkwer-ē-əm plural aquariums or aquaria ə-ˈkwer-ē-ə What is plural for cattle?Ĭattle can only be used in the plural and not in the singular: it is a plurale tantum.But there is another millennium to celebrate: the millennium of the 2000s, the years that begin with a 2. So we should definitely celebrate the official calendar millennium on January 1, 2001. The first 2000 years end with the year 2000, and the next thousand start with 2001, the first year of the third millennium. Although this single word is not being used in general. What do we call a period of 12 years?Įxplanation: Duodecennial word can be used as alternatively for a gap once in 12 years. What is 3 decades called?ģ0 years = 3 Decades. 10,000 years is called ‘decem millenniuum’ or myria-annum (though these are not commonly used).

What is a thousand years called