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idealize (v.)[idealize 词源字典]: 1786, probably formed from ideal (adj.) + -ize. Related: Idealized; idealizing.[idealize etymology, idealize origin, 英语词源]
ideally (adv.): "in the best conceivable situation," 1840, from ideal + -ly (2). Earlier "in an archetype" (1640s); "in idea or imagination" (1590s).
ideate (v.): c. 1600, from idea + -ate (2). Related: Ideated; ideating.
ideation (n.): 1829; see idea + -ation. Related: Ideational.
As we say Sensation, we might say also, Ideation; it would be a very useful word; and there is no objection to it, except the pedantic habit of decrying a new term. [James Mill, "Analysis of the Phenomena of the Human Mind," London, 1829]
idem: Latin, literally "the same" (see identical).
idempotent: 1870, from Latin idem "the same" + potentem "powerful" (see potent).
identical (adj.): 1610s, as a term in logic, from Medieval Latin identicus "the same," from Late Latin identitas "identity, sameness," ultimately from comb. form of Latin idem "the same" (from id "it, that one;" see id) + demonstrative suffix -dem. General sense of "being the same or very similar" is from 1630s. Replaced Middle English idemptical (late 15c.), from Medieval Latin idemptitas "identity," from Latin idem. Related: Identically.
identifiable (adj.): 1804, from identify + -able. Related: Identifiably.
identification (n.): 1640s, "treating of a thing as the same as another," from French identification, probably from identifier (see identify). Sense of "becoming or feeling oneself one with another" is from 1857. Sense of "determination of identity" is from 1859. Meaning "object or document which marks identity" is from 1947 (short for identification tag, card, etc.).
identifier (n.): "thing that identifies," 1870, agent noun from identify.
identify (v.): 1640s, "regard as the same," from French identifier, from identité (see identity). Sense of "recognize" first recorded 1769. Meaning "make one (with), associate (oneself)" is from 1780. Sense of "serve as means of identification" is attested by 1886. Related: Identified; identifying.
identity (n.): c. 1600, "sameness, oneness," from Middle French identité (14c.), from Late Latin (5c.) identitatem (nominative identitas) "sameness," from ident-, comb. form of Latin idem (neuter) "the same" (see identical); abstracted from identidem "over and over," from phrase idem et idem. [For discussion of Latin formation, see entry in OED.] Earlier form of the word in English was idemptitie (1560s), from Medieval Latin idemptitas. Term identity crisis first recorded 1954. Identity theft attested from 1995.
ideogram (n.): 1838, from comb. form of Greek idea (see idea) + -gram.
ideograph (n.): late 1830s, from comb. form of Greek idea (see idea) + -graph "instrument for recording; something written." Related: Ideographic (1822); ideographical.
ideological (adj.): 1797, from ideology + -ical. Related: Ideologically.
ideologue (n.): 1815, in reference to the French Revolutionaries, from French ideologue, from Greek idea (see idea) + -logos (see -logue). Earlier form was ideologist (1798).
ideology (n.): 1796, "science of ideas," originally "philosophy of the mind which derives knowledge from the senses" (as opposed to metaphysics), from French idéologie "study or science of ideas," coined by French philosopher Destutt de Tracy (1754-1836) from idéo- "of ideas," from Greek idea (see idea) + -logy. Later used in a sense "impractical theorizing" (1813). Meaning "systematic set of ideas, doctrines" first recorded 1909.
Ideology ... is usually taken to mean, a prescriptive doctrine that is not supported by rational argument. [D.D. Raphael, "Problems of Political Philosophy," 1970]
ides (n.): (plural) early 14c., "middle day of a Roman month," from Old French Ides (12c.), from Latin idus (plural), a word perhaps of Etruscan origin. The 15th of March, May, July, and October; the 13th of other months. "Debts and interest were often payable on the ides" [Lewis].
idio-: word-forming element meaning "one's own, personal, distinct," from Greek idio-, comb. form of idios "own, personal, private, one's own" (see idiom).
idiocrasy (n.): "peculiarity," 1680s, from Greek idiokrasia, from idio- (see idio-) + krasis "mixing, tempering" (see rare (adj.2)).