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quantum
quan·tum Q0015300 (kwŏn′təm)n. pl. quan·ta (-tə) 1. 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.2. A quantity or amount.3. A specified portion.4. Something that can be counted or measured.5. A unit of acetylcholine, released at the synaptic cleft of a neuromuscular junction.adj. Relating to or based upon quantum theory.
[Latin, from neuter of quantus, how great; see quantity.]quantum (ˈkwɒntəm) n, pl -ta (-tə) 1. (Atomic Physics) physics a. the smallest quantity of some physical property, such as energy, that a system can possess according to the quantum theoryb. a particle with such a unit of energy2. amount or quantity, esp a specific amount3. (often used with a negative) the least possible amount that can suffice: there is not a quantum of evidence for your accusation. 4. something that can be quantified or measured5. (modifier) loosely, sudden, spectacular, or vitally important: a quantum improvement. [C17: from Latin quantus (adj) how much]quan•tum (ˈkwɒn təm)
n., pl. -ta (-tə),
adj. n. 1. quantity or amount: the least quantum of evidence. 2. share; portion. 3. a large quantity. 4. a. the smallest excitation of a quantized wave or field, as a photon or phonon. b. the fundamental unit of a quantized physical property, as angular momentum, and the smallest amount by which its magnitude can change. adj. 5. sudden and significant: a quantum increase in productivity. [1610–20; Latin quantus how much] quan·tum (kwŏn′təm) Plural quanta A unit of energy, especially electromagnetic energy, that is the smallest physical quantity that can exist on its own. A quantum acts both like a particle and like an energy wave. Photons are examples of quanta.Thesaurus| Noun | 1. | quantum - a discrete amount of something that is analogous to the quantities in quantum theoryquantity - the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable | | 2. | quantum - (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory)quantity, measure, amount - how much there is or how many there are of something that you can quantifynatural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"quasiparticle - a quantum of energy (in a crystal lattice or other system) that has position and momentum and can in some respects be regarded as a particle |
quantumnoun1. That which is allotted:allocation, allotment, allowance, dole, lot, measure, part, portion, quota, ration, share, split.Informal: cut.Slang: divvy.2. A measurable whole:amount, body, budget, bulk, corpus, quantity.Translationsквантквантовыйколичествосущественныйзначительный
quantum
quantum leapA sudden or important change or improvement. Gary's new job in upper management is a quantum leap forward from his old position at the factory.See also: leap, quantumquantum jumpA sudden or important change or improvement. That brand-new shopping center is a quantum jump from the old, run-down mall that used to be in that location.See also: jump, quantumquantum leapA dramatic advance, especially in knowledge or method, as in Establishing a central bank represents a quantum leap in this small country's development. This term originated as quantum jump in the mid-1900s in physics, where it denotes a sudden change from one energy state to another within an atom. Within a decade it was transferred to other advances, not necessarily sudden but very important ones. See also: leap, quantuma quantum leap A quantum leap is a very great and sudden increase in the size, amount, or quality of something. The vaccine represents a quantum leap in healthcare. The scale of migration took a quantum leap in the early 1970s. Note: People sometimes say a quantum jump with the same meaning. We want a quantum jump in exports.See also: leap, quantumquantum leap a sudden large increase or advance. A literal quantum leap is the abrupt transition of an electron, atom, or molecule from one quantum state to another.See also: leap, quantuma quantum ˈleap (also a quantum ˈjump less frequent) a sudden very large increase, advance or improvement in something: This latest research represents a quantum leap in our understanding of the universe. ♢ The quantum leap in writing technology came with the introduction of personal computers.In physics, a quantum jump is a sudden change in a physical quality such as energy from one fixed level to another.See also: leap, quantumquantum leapA sudden, spectacular advance. The term comes from nuclear physics, where a quantum leap is an abrupt transition from one energy state to another within the submicroscopic atom. William Safire pointed out that while scientists emphasize the suddenness and discontinuity of such a change, the figurative term emphasizes the size of the advance. The term was used in physics from about 1950 and began to be transferred (at first in the form of quantum jump) to other events about 1955.See also: leap, quantumquantum
quantum Physicsa. the smallest quantity of some physical property, such as energy, that a system can possess according to the quantum theory b. a particle with such a unit of energy Quantum (physics) A term characterizing an excitation in a wave or field, connoting fundamental particlelike properties such as energy or mass, momentum, and angular momentum for this excitation. In general, any field or wave equation that is quantized, including systems already treated in quantum mechanics that are second-quantized, leads to a particle interpretation for the excitations which are called quanta of the field. This term historically was first applied to indivisible amounts of electromagnetic, or light, energy usually referred to as photons. The photon, or quantum of the electromagnetic field, is a massless particle, best interpreted as such by quantizing Maxwell's equations. Analogously, the electron can be said to be the quantum of the Dirac field through second quantization of the Dirac equation, which also leads to the prediction of the existence of the positron as another quantum of this field with the same mass but with a charge opposite to that of the electron. In similar fashion, quantization of the gravitational field equations suggests the existence of the graviton. The pi meson or pion was theoretically predicted as the quantum of the nuclear force field. Another quantum is the quantized lattice vibration, or phonon, which can be interpreted as a quantized sound wave since it travels through a quantum solid or fluid, or through nuclear matter, in the same manner as sound goes through air. The use of quantum as an adjective (quantum mechanics, quantum electrodynamics) implies that the particular subject is to be treated according to the modern rules that have evolved for quantized systems. See Elementary particle, Gravitation, Graviton, Maxwell's equations, Meson, Phonon, Photon, Quantum electrodynamics, Quantum field theory, Quantum mechanics quantum (kwon -tŭm) The minimum amount by which certain properties of a system, such as its energy or angular momentum, can change. The value of the property cannot therefore vary continuously but must change in steps: these steps are equal to or are integral multiples of the relevant quantum. This idea is the basis of quantum theory and quantum mechanics. The photon, for example, is a quantum of electromagnetic radiation.quantum[′kwän·təm] (communications) One of the subranges of possible values of a wave which is specified by quantization and represented by a particular value within the subrange. (quantum mechanics) For certain physical quantities, a unit such that the values of the quantity are restricted to integral multiples of this unit; for example, the quantum of angular momentum is Planck's constant divided by 2π. An entity resulting from quantization of a field or wave, having particlelike properties such as energy, mass, momentum and angular momentum; for example, the photon is the quantum of an electromagnetic field, and the phonon is the quantum of a lattice vibration. quantum
quantum [kwon´tum] (L.) an elemental unit of energy; the amount emitted or absorbed at each step when energy is emitted or absorbed by atoms or molecules.quan·tum, pl. quan·ta (kwahn'tŭm, -tă), 1. A unit of radiant energy (Q) varying according to the frequency (ν) of the radiation. 2. A certain definite amount. [L. how much] quan·tum, pl. quanta (kwahn'tŭm, -tǎ) 1. A unit of radiant energy (ε) varying according to the frequency (ν) of the radiation. 2. A certain definite amount. [L. how much]quantum - a quantity or amount.
- the minimum quantity in which a neurotransmitter is secreted.
- a unit of light.
photon The basic unit of radiant energy defined by the equationE = hνwhere h is Planck's constant (6.62 ✕ 10−34 joule ✕ second), ν the frequency of the light and E the energy difference carried away by the emission of a single photon of light. The term photon usually refers to visible light whereas the term quantum refers to other electromagnetic radiations. See quantum theory; wave theory; troland.quan·tum, pl. quanta (kwahn'tŭm, -tǎ) Unit of radiant energy (Q) varying by frequency (ν) of radiation. [L. how much]quantum
Related to quantum: quantum physics, quantum theory, Quantum computing, Quantum numbersquantum ‘how much’, the amount.QUANTUM
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quantum
Related to quantum: quantum physics, quantum theory, Quantum computing, Quantum numbersSynonyms for quantumnoun that which is allottedSynonyms- allocation
- allotment
- allowance
- dole
- lot
- measure
- part
- portion
- quota
- ration
- share
- split
- cut
- divvy
noun a measurable wholeSynonyms- amount
- body
- budget
- bulk
- corpus
- quantity
Words related to quantumnoun a discrete amount of something that is analogous to the quantities in quantum theoryRelated Wordsnoun (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory)Related Words- quantity
- measure
- amount
- natural philosophy
- physics
- quasiparticle
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