Source : Webster's Revised Unabridged Dictionary (1913)

Oxygenation \Ox`y*gen*a"tion\, n. [Cf. F. oxyg['e]nation.]
   (Chem.)
   The act or process of combining or of treating with oxygen;
   oxidation.

Source : WordNet®

oxygenation
     n : the process of providing or combining or treating with
         oxygen; "the oxygenation of the blood"