attenuation

noun

1. (countable, uncountable)A gradual diminishing of strength.
2. (countable, uncountable)A reduction in the level of some property with distance, especially the amplitude of a wave or the strength of a signal.
3. (countable, uncountable)A weakening in the virulence of a pathogen or other microorganism.
4. (countable, uncountable)The tapering of a leaf etc to a fine point.
5. (countable, uncountable)A fabrication process in which a material is stretched out into a thin shape.
6. (countable, uncountable)The reduction of the active principles of medicines to minute doses.
7. (countable, uncountable)The proportion of sugar that is converted to ethanol by a yeast.