This is the 166th most frequent Russian word.
период
The Russian word "период" translates to "period" in English, meaning a span of time or a phase.
In this sentence, 'период' refers to a span of time characterized by specific circumstances or events.
У нас был сложный период на работе.
We had a difficult period at work.
Here, 'период' denotes a regular time frame in a life cycle.
Биологи изучают период размножения у рыб.
Biologists study the breeding period of fish.
In this context, 'период' is a part of a specialized term referring to an organized table in chemistry.