Oxford Dictionary English private detective nounnoun BrE BrE//ˌpraɪvət dɪˈtektɪv// ; NAmE NAmE//ˌpraɪvət dɪˈtektɪv// (also private investigator) (informal private eye) Solving crime Add to my wordlistjump to other results a detective who is not in the police, but who can be employed to find out information, find a missing person, follow somebody, etc. See related entries: Solving crimeSee private detective in the Oxford Advanced American DictionaryCheck pronunciation: private detective oxfordlearnersdictionaries.com