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solid geometry the branch of geometry dealing with three-dimensional figures and surfaces.
solidify to make firm, hard, or solid. [4 definitions]
solidity the state or quality of being solid or firm; firmness, hardness, or substantiality. [2 definitions]
solid rocket any rocket that uses solid fuel.
Solid South formerly, in the United States, the southern states traditionally regarded as solidly supporting the Democratic Party.
solid-state being or using a technology that employs semiconductors and transistors to control the performance of electrical devices. [2 definitions]
solidus a gold coin in circulation during the periods of the Roman and Byzantine Empires. [2 definitions]
soliloquize to speak aloud what is in one's mind when, or as if when, no one is present or listening.
soliloquy an act of talking or a speech by one who is, or is considered to be, alone.
solipsism in philosophy, the theory that the self is the only verifiable reality. [2 definitions]
solitaire any of various card games for one person. [2 definitions]
solitary being, traveling, or living without others; alone; unaccompanied. [6 definitions]
solitary confinement the confinement of a prisoner in complete isolation from others, usu. used as a form of punishment.
soliton in physics, a solitary wave, or a solution to a type of equation that represents such a wave.
solitude the condition of living or being by oneself; isolation. [3 definitions]
solmization the act, process, or system of using syllables to represent the different notes of the musical scale, often as a teaching aid.
solo a performance by one featured performer. [6 definitions]
soloist a person who performs a solo.
Solo man a type of early human known from fossil skull remains found in Java, esp. near the Solo River.
Solomon according to the Old Testament, the third king of Israel, who reigned in the tenth century B.C., was renowned for his wisdom, and built the first temple in Jerusalem.
Solomon Islands an island country in the southwestern Pacific, east of New Guinea. [2 definitions]