- quantity, or amount
- a specified quantity; portion
- in the quantum theory, a (or the) fixed, elemental unit, as of energy, angular momentum, etc.
Origin of quantumL, neuter singular of quantus, how much: see quantity
- Physics a. The smallest amount of a physical quantity that can exist independently, especially a discrete quantity of electromagnetic radiation.b. This amount of energy regarded as a unit.
- A quantity or amount.
- A specified portion.
- Something that can be counted or measured.
- A unit of acetylcholine, released at the synaptic cleft of a neuromuscular junction.
Origin of quantumLatin from neuter of quantus how great ; see quantity .
- (now chiefly South Asia) The total amount of something; quantity. [from 17th c.]
- The amount or quantity observably present, or available. [from 18th c.]
- (physics) The smallest possible, and therefore indivisible, unit of a given quantity or quantifiable phenomenon. [from 20th c.]
- (mathematics) A definite portion of a manifoldness, limited by a mark or by a boundary.
From Late Latin quantum, noun use of neuter form of Latin quantus (“how much").
quantum - Computer Definition
The elementary quantity of radiant energy, a photon. See also photon.
quantum - Legal Definition