What does ACTIO IN REM mean?

ACTIO IN REM meaning in Law Dictionary

into the civil and common-law. An action for something; an action for the data recovery of something possessed by another. Inst. 4, 6, 1. An action for the administration of the right (or for redress for its intrusion) which was originally offered against most of the world, and not in every special good sense resistant to the individual sued, until he violated it. See IN REM.