This is the 951st most frequent Azerbaijani word.
heyətinin
"Heyətinin" means "of the team" or "of the staff" in English.
In this sentence, 'heyətinin' is the possessive form of 'heyət' (staff) with the third-person singular possessive suffix '-in'/'-nin'.
Heyətinin tərkibi genişləndirildi.
The staff's composition was expanded.
Here, 'heyətinin' denotes the possessive form, showing ownership over 'qərarları' (decisions).
Heyətinin qərarları icra edildi.
The decisions of the staff were implemented.
In this usage, 'heyətinin' remains possessive, indicating that the 'new member' belongs to the staff.