資料來源 : Webster's Revised Unabridged Dictionary (1913)

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.}