Etymology
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Words related to mass

*mag- 
also *mak-, Proto-Indo-European root meaning "to knead, fashion, fit." It forms all or part of: amass; among; macerate; magma; make; mason; mass (n.1) "lump, quantity, size;" match (n.2) "one of a pair, an equal;" mingle; mongrel.

It is the hypothetical source of/evidence for its existence is provided by: Greek magis "kneaded mass, cake," mageus "one who kneads, baker;" Latin macerare "soften, make soft, soak, steep;" Lithuanian minkyti "to knead;" Old Church Slavonic mazo "to anoint, smear;" Breton meza "to knead;" Old English macian "to make, form, construct, do," German machen "to make;" Middle Irish maistir "to churn."
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mission (n.)

1590s, "a sending abroad" (as an agent), originally of Jesuits, from Latin missionem (nominative missio) "act of sending, a dispatching; a release, a setting at liberty; discharge from service, dismissal," noun of action from past-participle stem of mittere "to release, let go; send, throw," which de Vaan traces to a PIE *m(e)ith- "to exchange, remove," also source of Sanskrit methete, mimetha "to become hostile, quarrel," Gothic in-maidjan "to change;" he writes, "From original 'exchange', the meaning developed to 'give, bestow' ... and 'let go, send'."

Meaning "an organized effort for the spread of religion or for enlightenment of a community" is by 1640s; that of "a missionary post or station" is by 1769. The diplomatic sense of "body of persons sent to a foreign land on commercial or political business" is from 1620s; in American English, sometimes "a foreign legation or embassy, the office of a foreign envoy" (1805).

General sense of "that for which one is sent or commissioned" is from 1670s; meaning "that for which a person or thing is destined" (as in man on a mission, one's mission in life) is by 1805. Meaning "dispatch of an aircraft on a military operation" (by 1929, American English) was extended to spacecraft flights (1962), hence, mission control "team on the ground responsible for directing a spacecraft and its crew" (1964). As a style of furniture, said to be imitative of furniture in the buildings of original Spanish missions to western North America, it is attested from 1900.

biomass (n.)
also bio-mass, "total weight of the organic substance or organisms in a given area," by 1969, from bio- + mass (n.1).
en masse 
French, literally "in mass" (see mass (n.1)).
massage (n.)

"application with the hands of pressure and strain upon muscles and joints of the body for therapeutic purposes," 1874, from French massage "friction of kneading" (by 1819), from masser "to massage," possibly from Arabic massa "to touch, feel, handle;" if so, probably the word was picked up in Egypt during the Napoleonic campaign there. Another possibility (suggested by the writings of 18c. French traveler Guillaume Joseph Le Gentil) is that French got it in colonial India from Portuguese amassar "knead," a verb from Latin massa "mass, dough" (see mass (n.1)). Massage parlor first attested 1894, from the start it was a euphemism or disguise name for "house of prostitution."

masses (n.)
"people of the lower class," 1836; plural of mass (n.1).
massive (adj.)

c. 1400, massif, "forming or consisting of a large mass, having great size and weight or solidity," from Old French massif "bulky, solid," from masse "lump" (see mass (n.1)). Of immaterial things, "substantial, great or imposing in scale," 1580s. Related: Massively; massiveness.

U.S. Cold War deterrent strategy of massive retaliation "threat of using thermonuclear weapons in response to aggression against the United States or its allies by the Soviet Union," whether nuclear or conventional, was introduced by Secretary of State J.F. Dulles in a speech on Jan. 12, 1954.

mass-media (n.)

singular mass-medium, "means of communication that reach large numbers of people," 1923; see mass (n.1) + media (n.).

mass-produce (v.)

"to manufacture in large quantities by standardized process," 1921, probably a back-formation from mass production (1919),  from mass (n.1) + production (v.). Related: Mass-produced; mass-producing.

massy (adj.)

"solid, weighty, compacted into or consisting of a mass," late 14c., from mass (n.1) + -y (2). Related: Massiness.