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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] 2. (Math.) A definite portion of a manifoldness, limited by a mark or by a boundary. --W. K. Clifford. [1913 Webster] 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. [L., as much suffices] (Med.), a sufficient quantity; -- abbreviated q. s. in pharmacy. Quantum valebat[L., as much at it was worth] (Law), a count in an action to recover of the defendant, for goods sold, as much as they were worth. --Blackstone. [1913 Webster]