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Multiple Meanings

His voice was very deep, a subterranean rumble.
Rick Yancey  --  The 5th Wave
under the ground

Much more rarely, subterraneancan refer to something that is lying beneath what is easily seen. For example, a "subterranean motive", could refer to a motive that is hidden from others, or even a motive that is not understood by the person who has it.
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