For Cave we have terms and definitions in 5 topics. The topics are Cellular Networking, Geologic, Physical Geography, Speleological and Telescope.

TIA Cellular Authentication and Voice Encryption Algorithm
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A natural opening in the ground extending beyond the zone of light and large enough to permit the entry of an average human.
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A natural cavity or recess that is roughly positioned horizontally to the surface of the Earth.
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A natural cavity in rock, large enough to be entered by people. May be water filled. May also be blocked partly or fully by sediment or ice. Commonly formed by solution in Limestone. Caves also form in many other rock types, and by many other processes.
Cave - Kinds of.
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Former United States telescope manufacturer, mid twentieth century. Made mostly amateur instruments. Particularly noted for the fine optics of the "Astrola" product line, of which the Newtonians are most famous.
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