vitiation

But in my opinion there is not in the sorrowful life of Russia a more mournful phenomenon than this lackadaisicalness and vitiation of thought.

From Yama: the pit by Bernard Guilbert Guerney

Will society do for the safety of this young soul what the doctor does for the body, when it is a question of contending against hereditary vitiation?

From The Mysteries of Paris, Volume 4 of 6 by Eugène Sue

In Everope is seen the extremity to which the vitiation here mentioned by the great moralist may sometimes be carried.

From Trevethlan (Vol 3 of 3) A Cornish Story. by William Davy Watson

In the former a leaky joint may cause the vitiation of the surrounding air as the producer-gas escapes; in the suction apparatus the same fault simply causes more air to be drawn in.

From Gas-Engines and Producer-Gas Plants A Practice Treatise Setting Forth the Principles of Gas-Engines and Producer Design, the Selection and Installation of an Engine, Conditions of Perfect Operation, Producer-Gas Engines and Their Possibilities, the Care of Gas-Engines and Producer-Gas Plants, with a Chapter on Volatile Hydrocarbon and Oil Engines by R. E. Mathot

There was a vitiation of the atmosphere that was not helped by a strong bodily odor, a stout and sturdy smell that came near to sickening Mr. Thompson.

From Burned Bridges by Bertrand W. Sinclair