1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Smithsonian  \Smith*so"ni*an\  (-s[=o]"n[i^]*an),  a. 
  Of  or  pertaining  to  the  Englishman  J.  L.  M.  Smithson,  or  to 
  the  national  institution  of  learning  which  he  endowed  at 
  Washington,  D.  C.;  as  the  Smithsonian  Institution; 
  Smithsonian  Reports.  --  n.  The  Smithsonian  Institution. 

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