There are 2 definitions of Mensa in English:

Mensa1

Syllabification: Men·sa
Pronunciation: /ˈmensə
 
/
Astronomy
1A small, faint southern constellation (the Table or Table Mountain), lying between Dorado and the south celestial pole. It contains part of the Large Magellanic Cloud.
1.1 (as genitive Mensae /ˈmensē/) Used with a preceding letter or numeral to designate a star in this constellation: the star Alpha Mensae

Origin

Latin.

Definition of Mensa in:

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Word of the day salmanazar
Pronunciation: ˌsalməˈnazər
noun
a wine bottle twelve times the standard size...

There are 2 definitions of Mensa in English:

Mensa2

Syllabification: Men·sa
Pronunciation: /ˈmensə
 
/
An international organization founded in England in 1945 whose members must achieve very high scores in IQ tests to be admitted.

Origin

Latin, 'table', with allusion to a round table at which all members have equal status.

Definition of Mensa in: