Etymology
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mesa (n.)

"high table land, in the U.S. Southwest, a broad and flat region between canyons or rivers," 1759, from Spanish mesa "plateau," literally "table," from Latin mensa "table" for sacred offerings or for meals (source of Romanian masa, Old French moise "table"), which de Vaan writes is probably the feminine of the past participle mensus ("measured") of metiri (from PIE root *me- (2) "to measure"),formed by analogy with pensus "weighed."  He compares Umbrian mefa, mefe, name of a certain sacrificial object, perhaps cake, and writes, "In Latin, the meaning then shifted from the offering itself to the object on which the offerings were placed."

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mensal (adj.2)
"pertaining to or used at a table," mid-15c., from Late Latin mensalis, from Latin mensa "table" (see mesa).
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commensal (adj.)

late 14c., "eating together at the same table, sharing the table with the host," from Medieval Latin commensalis, from com "with, together" (see com-) + mensa (genitive mensalis) "table" (see mesa). 

As a noun, "one who eats at the same table" (as another), early 15c. Biological sense "one of two animals or plants which live together but neither at the expense of the other" is attested from 1870.

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mensa (n.)

"altar top," 1848, Latin, literally "table," also "meal, supper," and "altar, sacrificial table," hence used in Church Latin for "upper slab of a church altar" (see mesa). With a capital M-, the name of an organization for people of IQs of 148 or more founded in England in 1946, the name chosen, according to the organization, to suggest a "round table" type group. The constellation (1763) originally was Mons Mensae "Table Mountain." It is the faintest constellation in the sky, with no star brighter than magnitude 5.0.

La Caille, who did so much for our knowledge of the southern heavens, formed the figure from stars under the Greater Cloud, between the poles of the equator and the ecliptic, just north of the polar Octans; the title being suggested by the fact that the Table Mountain, back of Cape Town, "which had witnessed his nightly vigils and daily toils," also was frequently capped by a cloud. [Richard Hinckley Allen, "Star Names and Their Meanings," London: 1899]
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Anasazi 
Name applied by their Navajo neighbors to modern Pueblo peoples of the U.S. southwest, and to various landscape features associated with them, from Navajo anaasazi "ancestors of the enemies." Said to first have been applied to the ancient Pueblo ruins of southwestern United States in the Mesa Verde region c. 1889 by rancher and trader Richard Wetherill, who began exploration of the sites in the area; established in archaeological terminology 1927.
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mesalliance (n.)

also misalliance, "marriage with a person of lower social position," 1782, from French mésalliance, from pejorative prefix mes- (from Latin mis-; see mis-) + alliance (see alliance). In English form misalliance from 1738.

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