This is the 996th most frequent Greek word.
τμήματος
"Τμήματος" means "of the department" or "of the section" in English.
In this sentence, 'τμήματος' refers to a department or division within a larger organization.
Ο υπεύθυνος του τμήματος μας κάλεσε σε συνάντηση.
The head of the department invited us to a meeting.
Here, 'τμήματος' again denotes the department, but emphasizes it as a physical space.
Η πόρτα του τμήματος ήταν ανοιχτή όλη τη μέρα.
The department's door was open all day.
Finally, 'τμήματος' is used in the sense of a section or subset within a certain context.