An investigation of a specialized or unconventional nature; (chiefly attributive) designating a police or military force that oversees or implements such an investigation; also in plural.
Origin
Early 20th century; earliest use found in Weekly Irish Times.
Definition of special investigation in US English:
special investigation
noun
An investigation of a specialized or unconventional nature; (chiefly attributive) designating a police or military force that oversees or implements such an investigation; also in plural.
Origin
Early 20th century; earliest use found in Weekly Irish Times.