Etymology
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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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*magh- 

Proto-Indo-European root meaning "to be able, have power." It forms all or part of: dismay; deus ex machina; may (v.1) "am able;" might (n.) "bodily strength, power;" main; machine; mechanic; mechanism; mechano-; mage; magi; magic.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit mahan "great;" Greek mēkhanē "device, means," mekhos, makhos "means, instrument;" Old Church Slavonic mošti, Russian moč' "can, be able;" Old English mæg "I can," Gothic mag "can, is able," Old High German magan, Old Norse magn "power, might."

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*maghu- 
Proto-Indo-European root meaning "young person" of either sex. It forms all or part of: maiden. It is the hypothetical source of/evidence for its existence is provided by: Avestan magava- "unmarried;" Old English magu "child, son, male descendant," Old English mægden, mæden "maiden, virgin, girl; maid, servant;" German Magd "maid, maidservant," Mädchen "girl, maid;" Old Irish maug "slave."
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*mak- 

*māk-, Proto-Indo-European root meaning "long, thin." It forms all or part of: emaciate; macro; macro-; macrobiotic; macron; meager; paramecium. It is the hypothetical source of/evidence for its existence is provided by: Greek makros "long, large," mēkos "length;" Latin macer "lean, thin;" Old Norse magr, Old English mæger "lean, thin."

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*man- (2)
Proto-Indo-European root meaning "hand."

It forms all or part of: amanuensis; command; commando; commend; countermand; demand; Edmund; emancipate; legerdemain; maintain; manacle; manage; manciple; mandamus; mandate; manege; maneuver; manicure; manifest; manipulation; manner; manque; mansuetude; manual; manubrium; manufacture; manumission; manumit; manure; manuscript; mastiff; Maundy Thursday; mortmain; Raymond; recommend; remand; Sigismund.

It is the hypothetical source of/evidence for its existence is provided by: Hittite maniiahh- "to distribute, entrust;" Greek mane "hand," Latin manus "hand, strength, power over; armed force; handwriting," mandare "to order, commit to one's charge," literally "to give into one's hand;" Old Norse mund "hand," Old English mund "hand, protection, guardian," German Vormund "guardian;" Old Irish muin "protection, patronage."
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*man- (1)

Proto-Indo-European root meaning "man."

It forms all or part of: alderman; Alemanni; fugleman; Herman; hetman; landsman; leman; man; manikin; mannequin; mannish; mensch; Norman; ombudsman; yeoman.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit manuh, Avestan manu-, Old Church Slavonic mozi, Russian muzh "man, male;" Old English man, mann "human being, person; brave man, hero; servant, vassal."

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*me- (4)

*mē-, Proto-Indo-European root meaning "to cut down grass or grain." It forms all or part of: aftermath; math (n.2) "a mowing;" mead (n.2) "meadow;" meadow; mow (v.).

It is the hypothetical source of/evidence for its existence is provided by: Greek (poetic) amao, Latin metere "to reap, mow, crop;" Italian mietere, Old Irish meithleorai "reapers," Welsh medi; Old English mawan "to mow," mæd "meadow."

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*me- (2)
*mē-, Proto-Indo-European root meaning "to measure." Some words may belong instead to root *med- "to take appropriate measures."

It forms all or part of: amenorrhea; centimeter; commensurate; diameter; dimension; gematria; geometry; immense; isometric; meal (n.1) "food, time for eating;" measure; menarche; meniscus; menopause; menses; menstrual; menstruate; mensural; meter (n.1) "poetic measure;" meter (n.2) unit of length; meter (n.3) "device for measuring;" -meter; Metis; metric; metrical; metronome; -metry; Monday; month; moon; parameter; pentameter; perimeter; piecemeal; semester; symmetry; thermometer; trigonometry; trimester.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit mati "measures," matra "measure;" Avestan, Old Persian ma- "to measure;" Greek metron "measure," metra "lot, portion;" Latin metri "to measure."
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*med- 

Proto-Indo-European root meaning "take appropriate measures."

It forms all or part of: accommodate; accommodation; commode; commodious; commodity; empty; immoderate; immodest; Medea; medical; medicament; medicaster; medicate; medication; medicine; medico; medico-; meditate; meditation; Medusa; meet (adj.) "proper, fitting;" mete (v.) "to allot;" modal; mode; model; moderate; modern; modest; modicum; modify; modular; modulate; module; modulation; mold (n.1) "hollow shape;" mood (n.2) "grammatical form indicating the function of a verb;" must (v.); premeditate; premeditation; remedial; remediation; remedy.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit midiur "I judge, estimate;" Avestan vi-mad- "physician;" Greek mēdomai "be mindful of," medesthai "think about," medein "to rule," medon "ruler;" Latin meditari "think or reflect on, consider," modus "measure, manner," modestus "moderate," modernus "modern," mederi "to heal, give medical attention to, cure;" Irish miduir "judge;" Welsh meddwl "mind, thinking;" Gothic miton, Old English metan "to measure out."

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*medhyo- 
Proto-Indo-European root meaning "middle." Perhaps related to PIE root *me- (2) "to measure."

It forms all or part of: amid; intermediate; mean (adj.2) "occupying a middle or intermediate place;" medal; medial; median; mediate; medieval; mediocre; Mediterranean; medium; meridian; mesic; mesial; meso-; meson; Mesopotamia; Mesozoic; mezzanine; mezzo; mezzotint; mid (prep., adj.); middle; Midgard; midriff; midst; midwife; milieu; minge; mizzen; moiety; mullion.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit madhyah, Avestan madiya- "middle," Greek mesos, Latin medius "in the middle, between; from the middle," Gothic midjis, Old English midd "middle," Old Church Slavonic medzu "between," Armenian mej "middle."
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