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Trimester
"Period" can refer to a punctuation mark (.), a length of time, such as a school period or menstrual period, or a specific historical era.
Contemporary means something at the present time. There is no set period.
present
The period of time marked by contraction of the ventricles
contemprary means that it is in the present
before Christ
The period between the end of the middle ages and the present. (APEX)
The period between the end of the middle ages and the present. (APEX)
The period between the end of the middle ages and the present. (APEX)
An age is a long period of time that can vary depending on context. In archaeology and geology, an age can refer to a specific time interval of thousands to millions of years. In everyday language, an age can refer to a more general, indeterminate period of time.
You have to have free time at school. It's called a lunch period.