vitiation

Noun

 * 1) a reduction in the value, or an impairment in the quality of something
 * 2) * 1810, George Wilson, M.D., F.R.D.E. Ch. II. General Sketch of Cavendish's Scientific Researches and Discoveries, in The Life of the Honble Henry Cavendish, p. 39.
 * air was universally reputed to be a simple or elementary body. It was liable, according to the phlogistians, to vitiation, by the addition to it of phlogiston being more or less phlogisticated, according to the degree of its power to support respiration and combustion.
 * 1) moral corruption
 * 2) an abolition or abrogation
 * 1) an abolition or abrogation