- a diplomatic official attached to an embassy or legation, especially in a technical capacity: a commercial attaché; a cultural attaché.
- a military officer who is assigned to a diplomatic post in a foreign country in order to gather military information: an air attaché; an army attaché; a naval attaché.
- Also at·ta·che. attaché case.
- a specialist attached to a diplomatic missionmilitary attaché
- British a junior member of the staff of an embassy or legation
1835, from French attaché “junior officer attached to the staff of an ambassador, etc.,” literally “attached,” past participle of attacher “to attach” (see attach). Attache case “small leather case for carrying papers” first recorded 1900.
A diplomatic officer attached to an embassy or consulate. Most attachés have specialties, such as military attachés, cultural attachés, economic attachés, and so forth.