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Meanings and definitions for OPJ

Officier de Police Judiciaire ("officer of judicial police"), an officer of the police in France, mainly responsible for investigating crimes.
Orthogonal Persistence for the Java platform, an approach to provide orthogonal persistence for Java (programming language).
The filename extension for the file format used by the graphing software Origin.
Obligatory Psychotic Jackass, a nickname for the character Logan Echolls from the television series Veronica Mars.