medio- Look up medio- at Dictionary.com
word-forming element from comb. form of Latin medius "middle" (see medial (adj.)).
mediocre (adj.) Look up mediocre at Dictionary.com
1580s, from Middle French médiocre (16c.), from Latin mediocris "of middling height or state, moderate, ordinary," figuratively "mediocre, mean, inferior," originally "halfway up a mountain," from medius "middle" (see medial (adj.)) + ocris "jagged mountain" (cognate with Greek okris "peak, point," Welsh ochr "corner, border," Latin acer "sharp;" see acrid). As a noun, "medicore thing or person," by 1834.
mediocritization (n.) Look up mediocritization at Dictionary.com
1917 (Will Durant), noun of state or action from mediocritize.
mediocritize (v.) Look up mediocritize at Dictionary.com
1854 (implied in mediocritizing); see mediocrity + -ize. Related: Mediocritized.
mediocrity (n.) Look up mediocrity at Dictionary.com
early 15c., "moderation; intermediate state or amount," from Middle French médiocrité and directly from Latin mediocritatem (nominative mediocritas) "a middle state, middling condition, medium," from mediocris (see mediocre). Neutral at first; disparaging sense began to predominate from late 16c. The meaning "person of mediocre abilities or attainments" is from 1690s. Before the tinge of disparagement crept in, another name for the Golden Mean was golden mediocrity.
meditate (v.) Look up meditate at Dictionary.com
1580s, "to ponder," back-formation from meditation, or else from Latin meditatus, past participle of meditari (see meditation). Related: Meditated; meditating.
meditation (n.) Look up meditation at Dictionary.com
c.1200, "contemplation; devout preoccupation; devotions, prayer," from Old French meditacion "thought, reflection, study," and directly from Latin meditationem (nominative meditatio) "a thinking over, meditation," noun of action from past participle stem of meditari "to meditate, think over, reflect, consider," frequentative form from PIE root *med- "to measure, limit, consider, advise, take appropriate measures" (cognates: Greek medesthai "think about," medon "ruler;" Latin modus "measure, manner," modestus "moderate," modernus "modern," mederi "to heal," medicus "physician;" Sanskrit midiur "I judge, estimate;" Welsh meddwl "mind, thinking;" Gothic miton, Old English metan "to measure;" also see medical).

Meaning "discourse on a subject" is early 14c.; meaning "act of meditating, continuous calm thought upon some subject" is from late 14c. The Latin verb also had stronger senses: "plan, devise, practice, rehearse, study."
meditative (adj.) Look up meditative at Dictionary.com
1650s, from Late Latin meditativus, from meditat-, past participle stem of Latin meditari (see meditation). Related: Meditatively; meditativeness.
Mediterranean Look up Mediterranean at Dictionary.com
"the sea between southern Europe and northern Africa," c.1400, from Late Latin Mediterraneum mare "Mediterranean Sea" (7c.), from Latin mediterraneus "midland;" the original sense being of "sea in the middle of the earth," from medius "middle" (see medial (adj.)) + terra "land, earth" (see terrain). The Old English name was Wendel-sæ, so called for the Vandals, Germanic tribe that settled on the southwest coast of it after the fall of Rome. The noun meaning "a person of Mediterranean race" is from 1888.
medium (n.) Look up medium at Dictionary.com
1580s, "a middle ground, quality, or degree," from Latin medium "the middle, midst, center; interval," noun use of neuter of adjective medius (see medial (adj.)). Meaning "intermediate agency, channel of communication" is from c.1600. That of "person who conveys spiritual messages" first recorded 1853, from notion of "substance through which something is conveyed." Artistic sense (oil, watercolors, etc.) is from 1854. Happy medium is the "golden mean," Horace's aurea mediocritas.
medium (adj.) Look up medium at Dictionary.com
1660s, "average," from medium (n.). The Latin adjective was medius. Meaning "intermediate" is from 1796. As a size designation from 1711. as a designation of cooked meat, it is attested from 1931, short for medium-rare (1881).
medlar (n.) Look up medlar at Dictionary.com
"small fruit-bearing tree," mid-14c. (in reference to the fruit itself), from Old French medler, variant of mesple, from Latin mespila "fruit of the medlar," from Greek mespilion, a foreign word of unknown origin. The Old English name was openærs, literally "open-arse."
medley (n.) Look up medley at Dictionary.com
c.1300, "hand-to-hand combat," from Old French medlee, variant of meslee (see meddle). Meaning "combination, mixture" is from mid-15c.; that of "musical combination consisting of diverse parts" is from 1620s.
medulla (n.) Look up medulla at Dictionary.com
hindmost segment of the brain, 1650s, from Latin medulla, literally "marrow," also "pith of plants," of unknown origin, perhaps related to or influenced by medius "middle" (but compare also Old Irish smiur, Welsh mer "marrow"). The word was used in the Latin senses in Middle English. Related: Medular; medullary.
medusa (n.) Look up medusa at Dictionary.com
"jellyfish," 1758, as genus name, from the name of one of the three Gorgons with snakes for hair, whose glance turned to stone him who looked upon it (attested in English from late 14c.). Her name is from Greek Medousa, literally "guardian," fem. present participle of the verb medein "to protect, rule over" (see Medea). The zoological name was chosen by Linnæus, suggested by the creature's long tentacles. Related: Medusoid.
meek (adj.) Look up meek at Dictionary.com
c.1200, "gentle, quiet, unaggressive; benevolent, kind; courteous, humble, unassuming;" of a woman, "modest," from a Scandinavian source such as Old Norse mjukr "soft, pliant, gentle," from Proto-Germanic *meukaz (cognates: Gothic muka-modei "humility," Dutch muik "soft"), of uncertain origin, perhaps from PIE *meug- "slippery, slimy." In the Bible, it translates Latin mansuetus from Vulgate (see mansuetude). Sense of "submissive" is from mid-14c.
meek (n.) Look up meek at Dictionary.com
"those who are meek," c.1200, from meek (adj.).
meekly (adv.) Look up meekly at Dictionary.com
c.1200, from meek (adj.) + -ly (2).
meekness (n.) Look up meekness at Dictionary.com
c.1200, meknesse; see meek (adj.) + -ness.
meerkat (n.) Look up meerkat at Dictionary.com
late 15c., "monkey," from Dutch meerkat "monkey" (related to Old High German mericazza), apparently from meer "lake" + kat "cat." But compare Hindi markat, Sanskrit markata "ape," which might serve as a source of a Teutonic folk-etymology, even though the word was in Germanic before any known direct contact with India. First applied to the small South African mammals in 1801.
meerschaum (n.) Look up meerschaum at Dictionary.com
type of soft white clay, 1784; from 1789 as "tobacco pipe with a bowl made of meerschaum clay," from German Meerschaum, literally "sea-foam," so called from its frothy appearance; from Old High German mari "sea" (see mere (n.)) + scum "scum" (see skim (v.)). A loan-translation of Latin spuma maris, itself said to be a loan translation of Greek halos akhne, from Persian kaf-i-darya.
meet (v.) Look up meet at Dictionary.com
Old English metan "to find, find out; fall in with, encounter; obtain," from Proto-Germanic *motjan (cognates: Old Norse mæta, Old Frisian meta, Old Saxon motian "to meet," Gothic gamotijan), from PIE root *mod- "to meet, assemble." Related to Old English gemot "meeting." Meaning "to assemble" is from 1520s. Of things, "to come into contact," c.1300. Related: Met; meeting. To meet (someone) halfway in the figurative sense is from 1620s.
meet (adj.) Look up meet at Dictionary.com
"proper, fitting," Old English gemæte, Anglian *gemete, "suitable, having the same dimensions," from Proto-Germanic *ga-mætijaz (cognates: Old Norse mætr, Old High German gimagi, German gemäß "suitable"), from collective prefix *ga- + PIE *med- "to measure" (see medical (adj.)). The basic formation is thus the same as that of commensurate.
meet (n.) Look up meet at Dictionary.com
1831 in the sporting sense, originally of gatherings for hunting, from meet (v.).
meeting (n.) Look up meeting at Dictionary.com
"action of coming together," Old English gemeting, verbal noun from meet (v.). Meaning "gathering of people for discussion, etc." is from 1510s. In 17c., it was applied generally to worship assemblies of nonconformists, but this now is retained mostly by Quakers.
meeting-house (n.) Look up meeting-house at Dictionary.com
also meetinghouse, 1630s, from meeting (n.) + house (n.).
Meg Look up Meg at Dictionary.com
fem. proper name; before the late 20c. rise in popularity of Megan it typically was a pet form of Margaret, and was "used dial. to indicate a hoyden, coarse woman, etc." [OED]
mega- Look up mega- at Dictionary.com
before vowels meg-, word-forming element often meaning "large, great," but in precise scientific language "one million" (megaton, megawatt, etc.), from Greek megas "great, large, vast, big, high, tall; mighty, important" (fem. megale), from PIE *meg- "great" (cognates: Latin magnus, Old English micel; see mickle). Mega began to be used alone as an adjective by 1982.
High-speed computer stores 2.5 megabits [headline in "Electronics" magazine, Oct. 1, 1957]
megabucks (n.) Look up megabucks at Dictionary.com
1946, originally "one million dollars," from mega- in the scientific sense + slang buck (n.) "dollar." A jocular coinage of U.S. scientists working on expensive atomic research.
megabyte (n.) Look up megabyte at Dictionary.com
1972, from mega- + byte.
The Sussex team has run the Forrester/Meadows models more than 1000 times on the UK's most powerful computer (the giant two-megabyte IBM 370/165 at Harwell). ["New Scientist," May 4, 1972]
megacity (n.) Look up megacity at Dictionary.com
also mega-city, 1968, from mega- + city.
megacycle (n.) Look up megacycle at Dictionary.com
1928, from mega- + cycle (n.).
megadeath (n.) Look up megadeath at Dictionary.com
1953, from mega- in scientific sense (one million) + death (n.). The death of one million persons, as a measure of the effectiveness of nuclear weapons. The resulting pile of dead bodies would be a megacorpse, according to writings on the topic.
megahertz (n.) Look up megahertz at Dictionary.com
1941, from mega- + Hertz.
megalith (n.) Look up megalith at Dictionary.com
huge prehistoric stone, 1853, back-formation from megalithic.
megalithic (adj.) Look up megalithic at Dictionary.com
1836, from mega- "large" + lithos "stone" (see litho-) + -ic.
megalo- Look up megalo- at Dictionary.com
word-forming element meaning "large, great, exaggerated," from comb. form of Greek megas "large, great" (stem megal-); see mickle.
megalocardia Look up megalocardia at Dictionary.com
1893, from megalo- + cardia "heart" (see cardiac).
megalomania (n.) Look up megalomania at Dictionary.com
"delusions of greatness," 1866, from French mégalomanie; see megalo- + mania "madness."
megalomaniac Look up megalomaniac at Dictionary.com
1882 (n.), 1883 (adj.), from megalomania (q.v.).
The megalomaniac differs from the narcissist by the fact that he wishes to be powerful rather than charming, and seeks to be feared rather than loved. To this type belong many lunatics and most of the great men of history. [Bertrand Russell, "The Conquest of Happiness"]
megalomaniacal (adj.) Look up megalomaniacal at Dictionary.com
1884, from megalomaniac + -al (1).
megalopolis (n.) Look up megalopolis at Dictionary.com
1832, from comb. form of Greek megas (genitive megalou) "great" (see mickle) + polis "city" (see polis). The word was used in classical times as an epithet of great cities (Athens, Syracuse, Alexandria), and it also was the name of a former city in Arcadia.
megaphone (n.) Look up megaphone at Dictionary.com
1878, coined (perhaps by Thomas Edison, who invented it) from Greek megas "great" (see mega-) + phone "voice" (see fame (n.)). Related: Megaphonic. In Greek, megalophonia meant "grandiloquence," megalophonos "loud-voiced."
megapixel (n.) Look up megapixel at Dictionary.com
by 1977, from mega- + pixel.
megaspore (n.) Look up megaspore at Dictionary.com
1857, from mega- + spore.
megaton (n.) Look up megaton at Dictionary.com
unit of explosive power equal to one million tons of TNT, 1952, from mega- + ton. Related: Megatonnage.
megavolt (n.) Look up megavolt at Dictionary.com
1868, from mega- + volt.
megawatt (v.) Look up megawatt at Dictionary.com
1900, from mega- + watt.
megillah (n.) Look up megillah at Dictionary.com
"long, tedious, complicated story," 1957, from Yiddish (as in a gantse Megillah "a whole megillah"), literally "roll, scroll," collective name of the five Old Testament books appointed to be read on certain feast days, from Hebrew meghillah, from galal "he rolled, unfolded." The slang use is in reference to the length of the text.
megrim Look up megrim at Dictionary.com
see migraine.