This is the 2223rd most frequent Turkish word.
adamı
"Adamı" means "the man" or "the person" in Turkish.
In this sentence, 'adamı' is the definite accusative form of 'adam,' meaning 'man,' and it refers to a specific individual who is the object of the verb 'tanımak' (to know).
O adamı tanıyor musun?
Do you know that man?
Here, 'adamı' appears as part of the compound noun 'iş adamı,' meaning 'businessman,' where it denotes a person in the context of their profession.
Bir iş adamı olmak istiyorum.
I want to be a businessman.
In this context, 'adamı' is again the definite accusative form of 'adam,' but this time it is part of a relative clause 'isteyen adamı,' specifying a particular man.