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Quantum Quan"tum, n.; pl. Quanta. [L., neuter of quantus how great, how much. See Quantity,] 1. Quantity; amount. ``Without authenticating . . . the quantum of the charges.' --Burke. 2. (Math.) A definite portion of a manifoldness, limited by a mark or by a boundary. --W. K. Clifford. Quantum meruit[L., as much as he merited] (Law), a count in an action grounded on a promise that the defendant would pay to the plaintiff for his service as much as he should deserve. Quantum sufficit, or Quantum suff.