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delusion (n.)[delusion 词源字典]: "act of misleading someone," early 15c.; as a form of mental derangement, 1550s, from Latin delusionem (nominative delusio) "a deceiving," noun of action from past participle stem of deludere (see delude).

Technically, delusion is a belief that, though false, has been surrendered to and accepted by the whole mind as a truth; illusion is an impression that, though false, is entertained provisionally on the recommendation of the senses or the imagination, but awaits full acceptance and may not influence action. Delusions of grandeur, the exact phrase, is recorded from 1840, though the two words were in close association for some time before that.[delusion etymology, delusion origin, 英语词源]
delusional (adj.): 1871, from delusion + -al (1).
delusive (adj.): c. 1600; see delusion + -ive.
deluxe (adj.): 1819, from French de luxe, literally "of luxury," from Latin luxus "excess, abundance" (see luxury).
delve (v.): Old English delfan "to dig" (class III strong verb; past tense dealf, past participle dolfen), common West Germanic verb (cognates: Old Saxon delban, Dutch delven, Middle High German telben "to dig"), from PIE root *dhelbh- (cognates: Lithuanian delba "crowbar," Russian dolbit', Czech dlabati, Polish dłubać "to chisel;" Russian dolotó, Czech dlato, Polish dłuto "chisel"). Weak inflections emerged 14c.-16c. Related: Delved; delving.
dem: representing pronunciation of them in Jamaican speech, from 1868. As a minced form of damn, attested from late 14c.
demagnetize (v.): 1839; see de- + magnetize. Related: Demagnetized; demagnetizing.
demagogic (adj.): 1831; see demagogue + -ic. Greek had demagogikos "fit for or like a demagogue."
demagogue (n.): 1640s, from Greek demagogos "popular leader," also "leader of the mob," from demos "people" (see demotic) + agogos "leader," from agein "to lead" (see act (n.)). Often a term of disparagement since the time of its first use, in Athens, 5c. B.C.E. Form perhaps influenced by French demagogue (mid-14c.).
demagogue (v.): by 1964, American English, from demagogue (n.). Related: Demagogued; demagoguing.
demagoguery (n.): 1855; see demagogue + -ery. Demagogy in the same sense is from 1650s, from Greek demagogia "leadership of the people."
demand (v.): late 14c., "ask, make inquiry," from Old French demander (12c.) "to request; to demand," from Latin demandare "entrust, charge with a commission" (in Vulgar Latin, "to ask, request, demand"), from de- "completely" (see de-) + mandare "to order" (see mandate). Meaning "to ask for as a right" is early 15c., from Anglo-French legal use. Related: Demanded; demanding.
demand (n.): late 13c., "a question," from Old French demande (see demand (v.)). Meaning "a request, claim" is from c. 1300. In the political economy sense (correlating to supply) it is attested from 1776 in Adam Smith.
demanding (adj.): early 15c., "asking, questioning," present participle adjective from demand (v.). Meaning "insistent" is by late 19c. Related: Demandingly.
demarcate (v.): 1816, back-formation from demarcation. Related: Demarcated; demarcating.
demarcation (n.): c. 1752, from Spanish linea de demarcacion or Portuguese linha de demarcaçao, name of the line laid down by Pope Alexander VI, May 4, 1493, dividing the New World between Spain and Portugal on a line 100 leagues west of the Cape Verde Islands. Applied from 1801 to other lines dividing regions. From Spanish de- (see de-) + marcar "to mark the boundaries of," from a Germanic source (see mark (n.1)).
demarche (n.): 1650s, "walk, step," from French démarche (15c.) literally "gait, walk, bearing," from démarcher (12c.) "to march," from de- (see de-) + marcher (see march (v.)). Meaning "a diplomatic step" attested from 1670s. A word never quite anglicized.
demark (v.): 1650s, abstracted from demarcation and altered by influence of mark (v.).
dematerialize (v.): 1884; see de- + materialize. Related: Dematerialized; dematerializing.
demean (v.): "lower in dignity," c. 1600, perhaps from de- "down" + mean (adj.) and modeled on debase. Indistinguishable in some uses from obsolete demean (see demeanor) which influenced it and may be its true source. Related: Demeaned; demeaning.