from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. Law Against a thing, such as property, status, or a right, rather than against a person. Used of an action or a judgment.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Against a thing (such as property) rather than a person

from the GNU version of the Collaborative International Dictionary of English

  • Lit., in or against a (or the) thing

from The Century Dictionary and Cyclopedia

  • In relation to a thing: as, an action in rem: opposed to in personam. See action, 8 .


Late Latin : Latin in, against + Latin rem, accusative of rēs, thing, matter.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin against the thing (Wiktionary)


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