This is the 980th most frequent Persian word.
شبانه
"شبانه" means "nocturnal" or "nightly" in English.
Here, 'شبانه' is used as an adjective modifying 'کلاس', meaning 'night class'.
من به یک کلاس شبانه میروم.
I attend a night class.
In this context, 'شبانه' functions as an adverb, describing when the tasks are completed, i.e., overnight.
او کارهایش را شبانه انجام میدهد.
He does his tasks overnight.
'شبانه' here is part of a compound noun, 'برنامه شبانه', meaning 'nighttime program'.