Definition of Smithsonian Institution in US English:

Smithsonian Institution

proper noun

  • A foundation for scientific research, established in 1836 and based in Washington, DC. It operates more than a dozen museums and institutes in Washington and other cities. It originated with a bequest in the will of English chemist and mineralogist James Smithson (1765–1829).

Pronunciation

Smithsonian Institution

/ˌsmiTHˌsōnēən ˌinstəˈt(y)o͞oSH(ə)n//ˌsmɪθˌsoʊniən ˌɪnstəˈt(j)uʃ(ə)n/