sol·​id-state | \ ˌsä-ləd-ˈstāt \

Definition of solid-state 

1 : relating to the properties, structure, or reactivity of solid material especially : relating to the arrangement or behavior of ions, molecules, nucleons, electrons, and holes in the crystals of a substance (such as a semiconductor) or to the effect of crystal imperfections on the properties of a solid substance solid-state physics
2a : utilizing the electric, magnetic, or optical properties of solid materials solid-state circuitry
b : using semiconductor devices rather than electron tubes a solid-state radio

First Known Use of solid-state

circa 1951, in the meaning defined at sense 1

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The first known use of solid-state was circa 1951

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