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mean (adj.1)[mean 词源字典]: "low-quality," c. 1200, "shared by all," from imene, from Old English gemæne "common, public, general, universal, shared by all," from Proto-Germanic *ga-mainiz "possessed jointly" (cognates: Old Frisian mene, Old Saxon gimeni, Middle Low German gemeine, Middle Dutch gemene, Dutch gemeen, German gemein, Gothic gamains "common"), from PIE *ko-moin-i- "held in common," a compound adjective formed from collective prefix *ko- "together" (Proto-Germanic *ga-) + *moi-n-, suffixed form of PIE root *mei- (1) "to change, exchange" (see mutable). Compare second element in common (adj.), a word with a sense evolution parallel to that of this word.

Of things, "inferior, second-rate," from late 14c. (a secondary sense in Old English was "false, wicked"). Notion of "so-so, mediocre" led to confusion with mean (n.). Meaning "inferior in rank or status" (of persons) emerged early 14c.; that of "ordinary" from late 14c.; that of "stingy, nasty" first recorded 1660s; weaker sense of "disobliging, pettily offensive" is from 1839, originally American English slang. Inverted sense of "remarkably good" (i.e. plays a mean saxophone) first recorded c. 1900, perhaps from phrase no mean _______ "not inferior" (1590s, also, "not average," reflecting further confusion with mean (n.)).[mean etymology, mean origin, 英语词源]
mean (n.): "that which is halfway between extremes," early 14c., from Old French meien "middle, means, intermediary," noun use of adjective from Latin medianus "of or that is in the middle" (see mean (adj.2)). Oldest sense is musical; mathematical sense is from c. 1500. Some senes reflect confusion with mean (adj.1). This is the mean in by no means (late 15c.).
mean (v.2): "calculate an arithmetical mean," 1882, from mean (n.).
mean (adj.2): "occupying a middle or intermediate place," mid-14c., from Anglo-French meines (plural), Old French meien, variant of moiien "mid-, medium, common, middle-class" (12c., Modern French moyen), from Late Latin medianus "of the middle," from Latin medius "in the middle" (see medial (adj.)). Meaning "intermediate in time" is from mid-15c. Mathematical sense is from late 14c.
mean-spirited (adj.): also meanspirited, 1690s, from mean (adj.1) + -spirited. Ancient Greek had the same image in mikropsykhos.
meander (n.): 1570s, "confusion, intricacies," from Latin meander "a winding course," from Greek Maiandros, name of a river in Caria noted for its winding course (the Greeks used the name figuratively for winding patterns). In reference to river courses, in English, from 1590s. Adjectival forms are meandrine (1846); meandrous (1650s).
meander (v.): "flow in a winding course" (of rivers), 1610s, from meander (n.). Of a person, "to wander aimlessly" (1831), originally of persons traveling on a river (1821), perhaps influenced by confusion with maunder [OED]. Related: Meandered; meandering.
meanie (n.): also meany, "cruel person," 1927, from mean (adj.) + -y (3).
meaning (n.): "sense, import, intent," c. 1300, from mean (v.).
meaningful (adj.): 1827, from meaning (n.) + -ful. Related: Meaningfully.
meaningless (adj.): 1730, from meaning + -less. Related: Meaninglessly; meaninglessness.
meanly (adv.): 1580s, "indifferently;" 1590s, "basely;" c. 1600, "illiberally;" from mean (adj.1) + -ly (2).
meanness (n.): 1550s, "weakness," from mean (adj.) + -ness. Sense of "baseness, poverty" is from 1650s; that of "stinginess" from 1755.
means (n.): "course of action," late 14c., from mean (n.); sense of "wealth" is first recorded c. 1600. Compare French moyens, German Mittel. Phrase by no means attested from late 15c.; means-test is from 1930.
meant: past participle of mean (v.).
meantime (n.): also mean time, mid-14c., from mean (adj.2) "middle, intermediate" + time (n.). Late 14c. as an adverb. In the mean space "meanwhile" was in use 16c.-18c.
meanwhile (n.): also mean while, mid-14c., from mean (adj.2) "middle, intermediate" + while (n.). Late 14c. as an adverb.
meany: see meanie.
measles (n.): infectious disease, early 14c., plural of Middle English masel, perhaps from Middle Dutch masel "blemish" (in plural "measles") or Middle Low German masele, from Proto-Germanic *mas- "spot, blemish" (cognates: Old High German masla "blood-blister," German Masern "measles").

There might have been an Old English cognate, but if so it has not been recorded. Form probably influenced by Middle English mesel "leprous" (late 13c.).
measly (adj.): "affected with measles," 1680s, from measle (see measles) + -y (2); sense of "meager and contemptible" first recorded 1864 in British slang.