What is the meaning of Attaché?

A diplomatic officer, usually one who plays a specific role.

attaché

attached, attached to, bound, committed, connected, devoted, fastened, fixed, joined-up, secured, strapped, tethered, tie-on, tied, wired

attaché, attache (employment of civil servant in several administrations)

past participle of attacher

attaché (diplomatic officer, usually one who plays a specific role)

attaché

Source: wiktionary.org