Quantum Definition: Latin: amount or extent. Related Terms: Quantum Meruit, Damages According to Latin for Lawyers, quantum has variations such as quantus and quanta, and means:"... how great, as, such."James Ballentine's Law Dictionary:"Quantum: quantity or amount. So much. How much."In Connelly v Western Union, the Court defined quantum as the sum total of two or more particular sums or quantities; the aggregate; the whole quantity; a totality.The term is part of the quantum meruit maxim and used to denote monetary damages (as in the quantum of damages) in a personal injury case. For example, this title of an English law book:"Kemp, David, The Quantum of Damages in a Personal Injury Case (London: Sweet & Maxwell, 2004)"REFERENCES:Anon., Latin for Lawyers, 3rd Ed. (London: Sweet & Maxwell Limited, 1960), page 1036Connelly v Western Union Tele. Co., 40 S.E. 618; also at 100 Va. 51 (Virginia, 1902) Categories & Topics: Dictionary of Latin Law Terms Tort and Personal Injury Law Dictionary Find you are constantly looking up definitions? Try our search provider (works in most modern browsers) If you find an error or omission in Duhaime's Legal Dictionary, or if you have legal term suggestion, we'd love to hear from you!