This is the 131st most frequent Persian word.
سیاسی
"Political"
Here, 'سیاسی' is used as an adjective describing a noun 'موضوعات' (topics), indicating that the topics pertain to politics.
این کتاب درباره موضوعات سیاسی است.
This book is about political topics.
Here, 'سیاسی' modifies the noun 'گروه' (group), describing the nature of the group as related to politics.
من در یک گروه سیاسی عضو هستم.
I am a member of a political group.
Here, 'سیاسی' is used to describe 'بحثها' (discussions), emphasizing that the discussions involve politics.