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Definition of Smithsonian
1. 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.
Definition of Smithsonian
1. Adjective. Of or pertaining to (w James Smithson) (1764–1829), British mineralogist and chemist whose bequest was used to set up the (w Smithsonian Institution) in the United States. ¹
¹ Source: wiktionary.com