energy definition, energy meaning | English dictionary

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      n   pl   , -gies  
1    intensity or vitality of action or expression; forcefulness  
2    capacity or tendency for intense activity; vigour  
3    vigorous or intense action; exertion  
4      (Physics)  
a    the capacity of a body or system to do work  
b    a measure of this capacity, expressed as the work that it does in changing to some specified reference state. It is measured in joules (SI units).,   (Symbol)    E      See also       kinetic energy       potential energy  
     (C16: from Late Latin energia, from Greek energeia activity, from energos effective, from en-2 + ergon work)  

alternative energy  
      n   a form of energy derived from a natural source, such as the sun, wind, tides, or waves,   (Also called)    renewable energy  
atomic energy  
      n      another name for       nuclear energy  
Atomic Energy Authority  
      n   (in Britain) a government body established in 1954 to control research and development in atomic energy,   (Abbrev.)    AEA  
Atomic Energy Commission  
      n   (in the U.S.) a federal board established in 1946 to administer and develop domestic atomic energy programmes,   (Abbrev.)    AEC  
binding energy  
      n     (Physics)  
1    the energy that must be supplied to a stable nucleus before it can undergo fission. It is equal to the mass defect  
2    the energy required to remove a particle from a system, esp. an electron from an atom  
conservation of energy  
      n   the principle that the total energy of any isolated system is constant and independent of any changes occurring within the system  
energy band  
      n     (Physics)   a range of energies associated with the quantum states of electrons in a crystalline solid. In a semiconductor or an insulator there is a valence band containing many states, most of which are occupied. Above this is a forbidden band with only a few isolated states caused by impurities. Above this is a conduction band containing many states most of which are empty. In a metal there is a continuous valence-conduction band  
   See also       energy gap  
energy conversion  
      n   the process of changing one form of energy into another, such as nuclear energy into heat or solar energy into electrical energy  
energy gap  
      n     (Physics)   the difference of energy between the bottom of the conduction band and the top of the valence band of the electrons in a crystalline solid. For values below about 2eV the substance is considered to be a semiconductor whilst for higher values it is considered to be an insulator  
energy level  
      n     (Physics)  
1    a constant value of energy in the distribution of energies among a number of atomic particles  
2    the energy of a quantum state of a system. The terms energy level and energy state are often used loosely to mean quantum state. This is avoided in precise communication  
Fermi energy   , level  
      n   the level in the distribution of electron energies in a solid at which a quantum state is equally likely to be occupied or empty  
     (C20: named after Enrico Fermi)  
fossil energy  
      n   heat energy released by burning fossil fuel  
free energy  
      n   a thermodynamic property that expresses the capacity of a system to perform work under certain conditions  
   See       Gibbs function       Helmholtz function  
HDR energy  
      n   hot dry rock energy; energy extracted from hot rocks below the earth's surface by pumping water around a circuit in the hot region and back to the surface  
high-energy physics  
      n      another name for       particle physics  
internal energy  
      n   the thermodynamic property of a system that changes by an amount equal to the work done on the system when it suffers an adiabatic change. It is the sum of the kinetic and potential energies of its constituent atoms, molecules, etc.,   (Symbol)    U, E  
kinetic energy  
      n   the energy of motion of a body, equal to the work it would do if it were brought to rest. The translational kinetic energy depends on motion through space, and for a rigid body of constant mass is equal to the product of half the mass times the square of the speed. The rotational kinetic energy depends on rotation about an axis, and for a body of constant moment of inertia is equal to the product of half the moment of inertia times the square of the angular velocity. In relativistic physics kinetic energy is equal to the product of the increase of mass caused by motion times the square of the speed of light. The SI unit is the joule but the electronvolt is often used in atomic physics.,   (Symbol)    Ek, K, T     (Abbrev.)    KE  
lattice energy  
      n     (Chem)   the energy required to separate the ions of a crystal to an infinite distance, usually expressed in joules per mole  
luminous energy  
      n   energy emitted or propagated in the form of light; the product of a luminous flux and its duration, measured in lumen seconds.,   (Symbol)    Qv  
      n   mass and energy considered as equivalent and interconvertible, according to the theory of relativity  
nuclear energy  
      n   energy released during a nuclear reaction as a result of fission or fusion,   (Also called)    atomic energy  
potential energy  
      n   the energy of a body or system as a result of its position in an electric, magnetic, or gravitational field. It is measured in joules (SI units), electronvolts, ergs, etc.,   (Symbol)    Ep, V, U   φ  ,   (Abbrev.)    PE  
radiant energy  
      n   energy that is emitted or propagated in the form of particles or electromagnetic radiation. It is measured in joules.,   (Symbol)    Qe  
renewable energy  
      n      another name for       alternative energy  
solar energy  
      n   energy obtained from solar power  
tidal energy  
      n   energy obtained by harnessing tidal power  
wave energy  
      n   energy obtained by harnessing wave power  
English Collins Dictionary - English Definition & Thesaurus  


activity, animation, ardour, brio, drive, efficiency, élan, elbow grease     (facetious)   exertion, fire, force, forcefulness, get-up-and-go     (informal)   go     (informal)   intensity, life, liveliness, pep, pluck, power, spirit, stamina, strength, strenuousness, verve, vigour, vim     (slang)   vitality, vivacity, zeal, zest, zip     (informal)  

English Collins Dictionary - English synonyms & Thesaurus  

tidal energy n.
renewable energy obtainable on coasts based on the sea or ocean low and high tides

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Collaborative Dictionary     English Definition
spend time and energy doing something that is pointless
expression arisen in the 15th century when Newcastle (England) was a major exporter of coal
abbr. acron.
Waste to Energy; Waste-to-energy (WtE) or energy-from-waste (EfW) is the process of generating energy in the form of electricity and/or heat from the primary treatment of waste
Mozette /moz-ette/ 1. A personality cult movement 2. A feminine adoration of Steven P. Morrissey 3. Followers of a charismatic leader with narcissistic traits, displaying an extraordinary amount of energy.
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