- the act of attenuating or the state of being attenuated.
- the process by which a virus, bacterium, etc., changes under laboratory conditions to become harmless or less virulent.
- Physics. a decrease in a property, as energy, per unit area of a wave or a beam of particles, occurring as the distance from the source increases as a result of absorption, scattering, spreading in three dimensions, etc.
Origin of attenuation
Examples from the Web for attenuation
The rapidity of the action diminished with the attenuation of the vapour.Fragments of science, V. 1-2
In spite of the pallor and attenuation, the face had a rare charm.A Little Girl of Long Ago
Amanda Millie Douglas
There is no growth in the idea of god, there is only an attenuation.Theism or Atheism
It is to be given at the first attenuation three times daily in half gr.An Epitome of Homeopathic Healing Art
B. L. Hill
She quite lacks the refinement, attenuation and imponderability you have achieved.The Gay Gnani of Gingalee
- the act of attenuating or the state of being attenuated
- the loss of energy suffered by radiation as it passes through matter, esp as a result of absorption or scattering
Word Origin and History for attenuation
early 15c., of persons, "emaciation;" of diet, "reduction," from Latin attenuationem (nominative attenuatio) "a lessening," noun of action from past participle stem of attenuare (see attenuate).
- A dilution, thinning, or weakening of a substance, especially a reduction in the virulence of a pathogen through repeated inoculation, growth in a different culture medium, or exposure to heat, light, air, or other weakening agents.
- The energy loss of an ultrasonic beam as it passes through a material.