One of the mysteries of the English language finally explained.
(Frequently with capital initials) the branch of a nation's army responsible for gathering information of military value, especially by means of espionage; the army intelligence department.
Mid 18th century (in an earlier sense). From army + intelligence.
army intelligence/ˌɑːmɪ ɪnˈtɛlɪdʒ(ə)ns/
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