The Collaborative International Dictionary of English v.0.48:

Sanitation \San`i*ta"tion\, n.
   The act of rendering sanitary; the science of sanitary
   conditions; the preservation of health; the use of sanitary
   measures; hygiene.
   [1913 Webster]

         How much sanitation has advanced during the last half
         century.                                 --H.
                                                  Hartshorne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sanitation
    n 1: the state of being clean and conducive to health
    2: making something sanitary (free of germs) as by sterilizing
       [syn: sanitation, sanitization, sanitisation]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "sanitation":
   antisepsis, decontamination, disinfection, disinfestation,
   epidemiology, flash pasteurization, fumigation, health physics,
   hygenics, hygiene, hygienics, mental hygiene, pasteurization,
   preventive dentistry, preventive medicine, prophylactic psychology,
   prophylactodontia, prophylaxis, public health, sterilization