поскольку

поскольку

"Since" or "because."

An introductory clause expressing the reason for the main action.

Поскольку идёт дождь, мы останемся дома.

Since it is raining, we will stay at home.

Provides the reason or explanation for the action.

Я не мог прийти на встречу, поскольку был занят.

I couldn't come to the meeting, as I was busy.

Introduces reasoning for the importance expressed in the main clause.

Поскольку вы эксперт в этой области, ваш совет очень важен.

Since you are an expert in this field, your advice is very important.