This is the 659th most frequent Chinese word.
集
"集" means "to gather," "to collect," or "a collection/group."
In this sentence, '集' means 'volume' or 'part' in a series of books or shows, indicating a subdivision within a collection.
这本书一共有十集。
This book has ten volumes in total.
Here, '集' is part of '集会', which means 'to gather' or 'to assemble', showing the act of coming together.
人们在公园集会庆祝节日。
People gather in the park to celebrate the holiday.
In this context, '集' is used in '集中的', implying a concentrated or gathered manner, referring to accumulation.