Mensa definitions

mĕn'sə
The top surface of an altar.
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A southern constellation between Hydrus and Volans.
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A S constellation between Dorado and Octans, containing part of the Large Magellanic Cloud.
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In planetary geology, a large mesa-like area of raised land.
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Mensa International; an organization for people with very high IQs.
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(astronomy) A summer constellation of the southern sky, originally named after Table Mountain in South Africa. It lies between the constellations of Hydrus and Volans.
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Origin of mensa

Originally named Montagne de la Table after Table Mountain in South Africa in 1756 by the French astronomer Nicolas Louis de Lacaille. By 1763 this had been Latinised as Mons Mensae. In 1922 the International Astronomical Union shortened this to Mensa. From Latin mensa, "table"