Definition of conduction in US English:



  • 1The process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.

    • ‘Their research shows that the surfactant layer must be analyzed in terms of its vibrational couplings, rather than by ordinary heat conduction.’
    • ‘So far, electron conduction has only been found in a few, high electron-affinity organic semiconductors, until now.’
    • ‘Can we predict the temperature profile from the known geometry and heat conduction of water?’
    • ‘Better heat conduction allows cooler internal operating temperature and hence less cracking and longer life.’
    • ‘The thermal emissions come to the surface through heat conduction in a few milliseconds as a function of the pulse energy and the synchronized signal capture.’
    • ‘Vanadium-vanadium bonds are stable below the transition temperature, which ‘lock’ the electrons and prevent conduction.’
    • ‘A hot copper cube in contact with a cold iron cube would, for example, heat it primarily by conduction.’
    • ‘This is the concept behind electrical conduction.’
    • ‘Heat will only leave the container by radiation, convection and conduction if the temperature of the container is higher than the surroundings.’
    • ‘The successive hops clearly do not have to involve an individually tagged proton; in this respect, proton currents resemble electrical conduction in a conductor.’
    • ‘There are four processes by which the body rids itself of excess heat: conduction, convection, radiation, and evaporation.’
    • ‘Electrical wiring and telephone lines can transmit such signals by conduction; walls can vibrate subtly, as can pipes, beams, ducts, and the like.’
    • ‘The disk is cooled primarily by conduction across the gap region, which can be filled with high-thermal-conductivity gases like helium.’
    • ‘A mixture optimized for a single property, such as heat conduction, looks like blobs of one material suspended in another.’
    • ‘Now physicists at Northwestern University show that, using the fact that electrons carry heat as well as charge, the conduction of heat may be similarly tuned.’
    • ‘Electrical conduction is the net motion of electric charge, and it cannot take place without the motion of matter on some scale.’
    • ‘In solids that conduct electricity, heat conduction is further enhanced by the drift of free electrons.’
    • ‘‘This is opposite of what you would think in terms of simple and ordinary heat conduction,’ Dlott said.’
    • ‘Under equal electrochemical potential gradients, conduction of protons across ion channels occurs at a rate typically an order-of-magnitude higher than that of other small ions.’
    • ‘Heat gain or loss results from four heat exchange processes - convection, conduction, radiation and evaporation.’
    1. 1.1 The process by which sound waves travel through a medium.
      • ‘Sound normally reaches the cochlea via the ear canal and the middle ear, but it may also reach the cochlea through bone conduction.’
      • ‘Deafness, therefore, is caused by conduction deafness.’
      • ‘It was found that sound conduction through dolphin tissues was more effective than that in a northern fur seal in a wide frequency range.’
      • ‘Furthermore a database having typical sound conduction components for a number of typical hearing impairments is provided.’
      • ‘We have seen how the normal outer and middle ears participate in sound conduction.’
      • ‘Egophony results from the change in frequency dependence of sound conduction when fluid replaces air and is heard over consolidation or pleural effusion.’
    2. 1.2 The transmission of impulses along nerves.
      • ‘Cocaine blocks the initiation or conduction of nerve impulses following local application by blocking depolarization via sodium influx inhibition.’
      • ‘If the slowing of nerve conduction affects all nerves roughly equally the diagnosis is likely to be the demyelinating form of Charcot-Marie-Tooth disease.’
      • ‘Its most important action is its ability to block the initiation or conduction of the nerve impulse following local application.’
      • ‘Second degree heart block results from partial blockade to impulse conduction; some impulses are conducted to the ventricles but others are blocked.’
      • ‘Physical examination was supplemented by laboratory tests, which included pulmonary function and peripheral nerve conduction.’
      • ‘MS occurs when parts of the covering of the brain and spinal cord are lost, which disrupts the conduction of the nerve impulse.’
      • ‘It is the influx of sodium into the cell that is responsible for generating an action potential, which causes depolarization and conduction of the nerve impulse.’
      • ‘A further burden is the high content of neurofilament protein susceptible to oxidative and nitrative changes leading to misfolding and aggregations and poor nerve conduction.’
      • ‘A flutter is defined as a rhythmic cycling of an electrical impulse and a fibrillation is defined as uncoordinated and ‘out-of-control’ impulse conduction.’
      • ‘Local anesthetics block the generation and conduction of all nerve impulses - sensory, motor, and autonomic - depending on the site of injection.’
      • ‘In a subset of patients monitored by serial testing, abnormalities in phrenic nerve conduction and diaphragmatic excursion normalized by 9 months after surgery.’
      • ‘Most cardiac arrhythmias result from disorders of impulse formation, impulse conduction or a combination of both.’
      • ‘Myelination increases substantially the speed of conduction of nerve impulses.’
      • ‘This is achieved by the propagation of the chemotactic signal, in a manner rather similar to the conduction of a nerve impulse.’
      • ‘Although the medication did reduce some nerve sorbitol and there was some improvement in nerve conduction, the medication's efficacy was limited, and adverse effects were problematic.’
      • ‘If aluminium causes direct neuronal death, why would this lead to slowing of conduction along the axons of the optic nerves?’
      • ‘Thus, we evaluated these patients for the presence of antibodies to 9 neural antigens, as well as for evidence of abnormalities in peripheral nerve conduction.’
      • ‘Disturbances in this ration can alter cardiac rhythms, transmission and conduction of nerve impulses, and muscle contraction.’
      • ‘After nerve conduction tests the diagnosis was peripheral sensory neuropathy.’
      • ‘Damage to the Schwann cells leads to impairment of nerve conduction.’
    3. 1.3 The conveying of fluid through a pipe or other channel.
      • ‘This number is explained in terms of channel architecture and conduction mechanism.’
      • ‘Carbon nanotubes, unmodified (pristine) and modified through charged atoms, were simulated in water, and their water conduction rates determined.’
      • ‘The results show a dislocation of the nanotube indicative of a possible disassembly process that may influence the channel conduction.’
      • ‘This kind of cell is better for fluid conduction than physical support.’
      • ‘A fluid handling port array (102) includes at least one fluid conduction bore.’


Mid 16th century (in the senses ‘provision for safe passage’ and ‘leadership’): from Latin conductio(n-), from the verb conducere (see conduct).