at·ta·ché 
(ăt′ə-shā, ă-tă-)
(ăt′ə-shā, ă-tă-)n.
1. A person officially assigned to the staff of a diplomatic mission to serve in a particular capacity: a cultural attaché; a military attaché.
2. An attaché case.
[French, from past participle of attacher, to attach, from Old French attachier; see ATTACH.]