This is the 611th most frequent Greek word.
διοίκηση
Administration or management.
In this sentence, "διοίκηση" refers to the administrative management of an organization.
Η διοίκηση της εταιρείας ανακοίνωσε νέα στρατηγική.
The management of the company announced a new strategy.
Here, "διοίκηση" is used to describe the field of study or activity related to administration in a specific domain.
Ο καθηγητής μας διδάσκει μαθήματα διοίκησης επιχειρήσεων.
Our professor teaches us courses in business administration.
In this usage, "διοίκηση" refers to the act of managing or administering projects.