'Quantum' definitions:

Definition of 'quantum'

From: WordNet
noun
A discrete amount of something that is analogous to the quantities in quantum theory
noun
(physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory)

Definition of 'Quantum'

From: GCIDE
  • 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]

Synonyms of 'quantum'

From: Moby Thesaurus