The Collaborative International Dictionary of English v.0.48:

Sternutation \Ster`nu*ta"tion\, n. [L. sternutatio, fr.
   sternutare to sneeze, intens. from sternuere.]
   The act of sneezing. --Quincy.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sternutation
    n 1: a symptom consisting of the involuntary expulsion of air
         from the nose [syn: sneeze, sneezing, sternutation]