This is the 302nd most frequent Chinese word.
社
"Society," "community," or "organization."
'社' in this sentence is used as part of the term '社会' meaning 'society,' indicating a service that attends to societal needs.
这家公司是一家大型的国际社会服务公司。
This company is a large international social service organization.
In this context, '社' refers to a 'group' or 'association' formed for a particular activity.
村里的青年决定成立一个读书社。
The youth of the village decided to establish a reading group.
Here, '社' is used to denote 'club' or 'group' as part of a larger organization, specifically a student organization.