(plural: attachés‘; female: attachée; pronunciation: please listen to the video you see on the right and bottom of this text)
a person whose job is to help an ambassador of one country in another country;
a qualified person who is attached to the administrative staff of a diplomat or a head of a state,
There are several kinds of attachés: military/defence attaché, cultural attaché, commercial attaché, press attaché, etc.
The duties of a kind of attaché depends greatly on the area of his specialty, i.e. a military attaché helps the military officers do their job more effectively; a press attaché looks after the publicity side of his boss’s activities and a commercial attaché sees that the transactions of trade and commerce are done smoothly and profitably.