A period of 100 years is called a century.
There are a hundred years in a century.
centum - hundred (latin) 1. centenarian - somebody who is a hundred years of age or more. 2. century - a period of a hundred years in a dating system
A period of ten years is called a decade. Sometimes a decade is used more specifically, to refer to a ten-year period that starts with a year that ends in zero. For example, "the sixties" or "the 1960s" refers to the years 1960-1969.
There is no single word in English for a period of 300 years. Three centuries. As an adjective, or a noun referring to the anniversary of 300 years, you could use tricentennial.
Twenty of anything is called a score. This can be years, eggs, cars, whatever. Although this term is still used and recognized, it is becoming antiquated. If you're looking for a stand alone word for 20 years (i.e. not including the word years) there isn't one, but a decade is 10 years, so you could say two decades. A bit more on score: Score is singular when used for a specific quantity and plural for indeterminate quantities, just like hundred, thousand, million, etc. For example: ten score cars went over the bridge; two hundred cars went over the bridge; scores of cars went over the bridge; hundreds of cars went over the bridge.
A period of 100 years is a century
A period of one hundred thousand years is called a "hectocentury." In geological and paleoclimatic contexts, this timescale is often relevant for studying climate cycles and major geological events.
A period of 600 years is often referred to as a sexcentenary.
There are a hundred years in a century.
a century
a century
Two hundred years could be called: - two centuries - twenty decades - two-hundred years
THe Punic wars
A period of 100 years is a century
You call a hundred years a century. If someone lives to one hundred years, that is considered to be quite an achievement.
A person over a hundred years old is called a centenarian.
Rostam was an Iranian warrior who reappears periodically over a period of three hundred years to drive back the Turks.