altisonant

adjective
al·​tis·​o·​nant | \(ˈ)al¦tisᵊnənt\

Definition of altisonant 

archaic

: lofty or pompous : high-sounding

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First Known Use of altisonant

1612, in the meaning defined above

History and Etymology for altisonant

alti- + sonant

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The first known use of altisonant was in 1612

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