Attenuation

Noun

1. A gradual diminishing of strength.
2. A reduction in the level of some property with distance, especially the amplitude of a wave or the strength of a signal.
3. A weakening in the virulence of a pathogen or other microorganism.
4. The tapering of a leaf etc to a fine point.
5. A fabrication process in which a material is stretched out into a thin shape.