Etymology
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mag (adj.)

1969 in reference to car wheels, "made of magnesium alloy." As an abbreviation of magazine, it dates from 1801.

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Mag 

common pet form of the fem. proper name Margaret, attested since Middle English. Compare magpie. Mag's tales "far-fetched stories, nonsense" is from early 15c.

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*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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magma (n.)

mid-15c., "dregs, any crude mixture of organic matter," from Latin magma "dregs of an ointment," from Greek magma "thick unguent, ointment," from root of massein "to knead, mold," from PIE root *mag- "to knead, fashion, fit." Geological meaning "molten or semi-molten rock" is by 1859. Related: Magmatic.

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amass (v.)
late 15c., "to heap up for oneself," from Old French amasser "bring together, assemble, accumulate" (12c.), from à "to" (see ad-) + masser, from masse "lump, heap, pile" (from PIE root *mag- "to knead, fashion, fit"). Related: Amassed; amassing; amassable.
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macerate (v.)

late 15c., "soften and separate by steeping in a fluid," a back-formation from maceration, or else from Latin maceratus, past participle of macerare "to make soft or tender; soften by steeping or soaking;" in transferred sense "to weaken" in body or mind, "to waste away, enervate," which is related to maceria "garden wall," originally "of kneaded clay," probably from PIE *mak-ero-, suffixed form of root *mag- "to knead, fashion, fit," but there are phonetic difficulties. Related: Macerated; macerating.

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mongrel (n.)

mid-15c., "individual or breed of dog resulting from repeated crossings or mixture of several different varieties," from obsolete mong "mixture," from Old English gemong "mingling" (base of among), from Proto-Germanic *mangjan "to knead together" (source of mingle), from a nasalized form of PIE root *mag- "to knead, fashion, fit." With pejorative suffix -rel.

The distinction between a mongrel and a hybrid (a cross between two different breeds) is not always observed. Meaning "person not of pure race" is attested from 1540s. As an adjective, "of a mixed or impure breed," from 1570s.

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mingle (v.)

mid-15c., menglen, transitive, "mix, blend, form a combination of, bring (something and something else) together," frequentative of Middle English myngen "to mix," from Old English mengan (related to second element in among), from Proto-Germanic *mangjan "to knead together" (source also of Old Saxon mengian, Old Norse menga, Old Frisian mendza, German mengen), from a nasalized form of PIE root *mag- "to knead, fashion, fit."

The formation may have been suggested by cognate Middle Dutch mengelen. Intransitive sense of "to be or become joined, combined, or mixed" is by 1520s. Of persons, "enter into intimate relation, join with others, be sociable," from c. 1600. Related: Mingled; mingling; minglement.

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among (prep.)

"in, in the midst of," early 12c., from Old English onmang, in late Old English sometimes amang, a contraction of ongemang "among, during," from phrase on gemang, literally "in the crowd or company (of)," from on (see a- (1)) + gemengan "to mingle," from Proto-Germanic *mangjan "to knead together," which is perhaps from a nasalized form of PIE root *mag- "to knead, fashion, fit." The collective prefix ge- was dropped 12c. leaving onmong, amang, among. Compare Old Saxon angimang "among, amid;" Old Frisian mong "among."

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match (n.2)

"one of a pair, an equal." Middle English macche, from Old English mæcca "companion, mate, one of a pair, wife, husband, one suited to another, an equal," from gemæcca, from Proto-Germanic *gamakon "fitting well together" (source also of Old Saxon gimaco "fellow, equal," Old High German gimah "comfort, ease," Middle High German gemach "comfortable, quiet," German gemach "easy, leisurely"), from PIE root *mag- "to knead, fashion, fit."

Meaning "person or thing that exactly corresponds to another" is from c. 1400. Middle English sense of "matching adversary, person able to contend with another" (c. 1300) led to sporting meaning "contest," which is attested from 1540s. Meaning "a matrimonial compact" is from 1570s.

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