a convicted criminal, who, deemed too dangerous to be released, may be kept incarcerated for an indefinite period of time.
Type: 5. Frequency — The term is part of the Canadian legal tradition at least since the 1960s. Although found elsewhere, it is of high frequency in Canadian English (see Chart 1).
See also ITP Nelson, s.v. "dangerous offender", which is marked "Law", COD-2, which marks it "Cdn (Law)".