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Origin and history of demagnetize

demagnetize(v.)

"deprive of magnetic polarity," 1835; see de- + magnetize. Related: Demagnetized; demagnetizing.

also from 1835

Entries linking to demagnetize

magnetize(v.)

"charge or supply with magnetic properties," 1799, from magnet + -ize. Related: Magnetized; magnetizing. From 1785 in now-obsolete sense of "to mesmerize, hypnotize."

demagnetization(n.)

"act or process of depriving of magnetic polarity," 1844, noun of action from demagnetize.

de-

active word-forming element in English and in many verbs inherited from French and Latin, from Latin de "down, down from, from, off; concerning" (see de), also used as a prefix in Latin, usually meaning "down, off, away, from among, down from," but also "down to the bottom, totally" hence "completely" (intensive or completive), which is its sense in many English words.

As a Latin prefix it also had the function of undoing or reversing a verb's action, and hence it came to be used as a pure privative — "not, do the opposite of, undo" — which is its primary function as a living prefix in English, as in defrost (1895), defuse (1943), de-escalate (1964), etc. In some cases, a reduced form of dis-.

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    alert
    "on the watch," 1610s, from French alerte "vigilant" (17c.), from prepositional phrase à l'erte "on the watch," from Italian all'erta "to the height." The second element is from erta "lookout, high tower," noun use of fem. of erto, past participle of ergere "raise up," from Latin
    alter
    late 14c., "to change (something), make different in some way," from Old French alterer "to change, alter," from Medieval Latin alterare "to change," from Latin alter "the other (of the two)," from PIE root *al- (1) "beyond" + comparative suffix -ter (as in other). Intransitive s
    change
    c. 1200, "to alter, make different, change" (transitive); early 13c. as "to substitute one for another;" mid-13c. as "to make (something) other than what it was, cause to turn or pass from one state to another;" from late 13c. as "to become different, be altered" (intransitive),
    modify
    late 14c., modifien, "alter, amend, adjust, change the properties, form, or function of;" also "set limits, keep within the bounds of reason; choose a middle course," from Old French modifier (14c.), from Latin modificare "to limit, measure off, restrain," from modus "measure, ma
    delete
    "destroy, eradicate," 1530s, from Latin deletus, past participle of delere "destroy, blot out, efface," from delevi, originally perfective tense of delinere "to daub, erase by smudging" (as of the wax on a writing table), from de "from, away" (see de-) + linere "to smear, wipe,"
    desultory
    1580s, "skipping about, jumping, flitting" in a figurative sense, from Latin desultorius "hasty, casual, superficial," adjective form of desultor (n.) "a rider in the circus who jumps from one horse to another while they are in gallop," from desul-, stem of desilire "jump down,"
    authentic
    mid-14c., autentik, "authoritative, duly authorized" (a sense now obsolete), from Old French autentique "authentic; canonical" (13c., Modern French authentique) and directly from Medieval Latin authenticus, from Greek authentikos "original, genuine, principal," from authentes "on
    hold
    Middle English holden, earlier halden, from Old English haldan (Anglian), healdan (West Saxon), "to contain; to grasp; to retain (liquid, etc.); to observe, fulfill (a custom, etc.); to have as one's own; to have in mind (of opinions, etc.); to possess, control, rule; to detain,
    pilot
    1510s, "one who steers a ship," especially one who has charge of the helm when the ship is passing in or out of harbor, from French pillote (16c.), from Italian piloto, supposed to be an alteration of Old Italian pedoto, which usually is said to be from Medieval Greek *pedotes "r
    eminent
    early 15c., "standing or rising above other places; exceeding other things in quality or degree;" from Old French éminent "prominent" (13c.) or directly from Latin eminentem (nominative eminens) "standing out, projecting, prominent, high," figuratively "distinguished, distinctive

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