loss

deafness

[def]

Partial or total inability to hear. In conduction deafness, the passage of sound vibrations through the ear is interrupted. The obstacle may be earwax, a ruptured eardrum, or stapes fixation, which prevents the stapes bone from transmitting sound vibrations to the inner ear. In sensorineural deafness, a defect in the sensory cells of the inner ear (e.g., injury by excessive noise) or in the vestibulocochlear or eighth cranial nerves prevents the transmission of sound impulses to the auditory centre in the brain. Some deaf people are helped by hearing aids or cochlear implants; others can learn to communicate with sign language and/or lip reading.

Learn more about deafness with a free trial on Britannica.com.

loss ' may refer to:

  • A negative difference between retail price and cost of production
  • An event in which the team or individual in question did not win.
  • Loss (baseball), a pitching statistic in baseball
  • Attenuation, a reduction in amplitude and intensity of a signal
  • In telecommunications, loss is a decrease in signal in a communications system:
    • Angular misalignment loss, power loss caused by the deviation from optimum angular alignment
    • Bridging loss, the loss that results when an impedance is connected across a transmission line
    • Coupling loss, the loss that occurs when energy is transferred from one circuit, optical device, or medium to another
    • Insertion loss, the decrease in transmitted signal power resulting from the insertion of a device in a transmission line or optical fiber
    • Path loss, the attenuation undergone by an electromagnetic wave in transit from a transmitter to a receiver
      • Free-space path loss, the loss in signal strength that would result if all influences were sufficiently removed having no effect on its propagation
    • Reflection loss, a loss which causes energy to be reflected back toward its source
    • Return loss, the ratio of the amplitude of the reflected wave to the amplitude of the incident wave
  • in laser physics, loss (or background loss, or round-trip loss) may refer to the part of the energy of the optical field, that becomes unusable at each rond-trip in the cavity due to the scattering or absorption.

In the arts:

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