The Collaborative International Dictionary
Inspector \In*spect"or\, n. [L.: cf. F. inspecteur.]
One who inspects, views, or oversees; one to whom the supervision of any work is committed; one who makes an official view or examination, as a military or civil officer; a superintendent; a supervisor; an overseer.
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A police officer, typically holding a rank one below superintendent, and in some cases in charge of several precincts; as, inspector Clousseau is investigating the case.
Inspector general (Mil.), a staff officer of an army, whose duties are those of inspection, and embrace everything relative to organization, recruiting, discharge, administration, accountability for money and property, instruction, police, and discipline.
Wiktionary
n. a senior official responsible for inspecting conformance to the standards in a civil or military organization
WordNet
n. a military officer responsible for investigations
Wikipedia
An inspector general is an investigative official in a civil or military organization. The plural of the term is "inspectors general".
Usage examples of "inspector general".
We have many stories but they say first he had a fief in Hemi, near Yokohama, then went with his family to Nagasaki as inspector general of all foreigners.
Keeping his seat was Paul Krendler of the Inspector General's Office.
All Deputy Assistant Inspector General Krendler heard was humming as he went out the door.