The period of time that the school year is divided into is called a "term." Each term typically consists of several weeks or months during which students attend classes and complete coursework.
That is called "acceleration". In symbols, that would be a = dv/dt; this means change in velocity divided by change in time, for a small time period.
A time a person rules is called a 'Ruling Period' or 'Reign'
Pay period
What you are able to earn in a given period of time is called your earning potential.
A 2000-year time period is known as a millennium.
You have to have free time at school. It's called a lunch period.
Its not really divided from start and end, but the era/period of time was called Division
installment debt
That is called "acceleration". In symbols, that would be a = dv/dt; this means change in velocity divided by change in time, for a small time period.
Trimester
A time a person rules is called a 'Ruling Period' or 'Reign'
the paleocene epoch is in the paleogene time period.
Average speed over a period of time = (distance covered in a period of time) divided by (time it took to cover the distance).
The time period from fertilization to birth is called gestation.
It was called the Jacobean period.
The medieval period lasted for a thousand years. During most of that time there was no country called Spain and the land now part of Spain was divided into many different and changing kingdoms.
fossil record geologic time scale