incorporate (v.) Look up incorporate at Dictionary.com
late 14c., "to put (something) into the body or substance of (something else), blend; absorb, eat," also "solidify, harden," often in medical writing, from Late Latin incorporatus, past participle of incorporare "unite into one body, embody, include," from Latin in- "into, in, on, upon" (see in- (2)) + verb from corpus (genitive corporis) "body" (see corporeal).

Meaning "to legally form a body politic with perpetual succession and power to act as one person, establish as a legal corporation" is from mid-15c. Intransitive sense of "unite with another body so as to become part of it" is from 1590s. Related: Incorporated; incorporating.
incorporation (n.) Look up incorporation at Dictionary.com
late 14c., incorporacioun, "act or process of combining substances; absorption of light or moisture," from Old French incorporacion or directly from Late Latin incorporationem (nominative incorporatio) "an embodying, embodiment," noun of action from past participle stem of incorporare "unite into one body" (see incorporate (v.)). Meaning "the formation of a corporate body (such as a guild) by the union of persons, forming an artificial person," is from early 15c.
Incorporation, n. The act of uniting several persons into one fiction called a corporation, in order that they may be no longer responsible for their actions. A, B and C are a corporation. A robs, B steals and C (it is necessary that there be one gentleman in the concern) cheats. It is a plundering, thieving, swindling corporation. But A, B and C, who have jointly determined and severally executed every crime of the corporation, are blameless. [Ambrose Bierce, 1885]
incorporeal (adj.) Look up incorporeal at Dictionary.com
early 15c., "spiritual, immaterial," with -al (1) and Late Latin incorporeus "without body," from in- "not" (see in- (1)) + adjective from corpus (genitive corporis) "body" (see corporeal). The Old French adjective was incorporel.
incorrect (adj.) Look up incorrect at Dictionary.com
early 15c., "uncorrected, not chastened into obedience," of sinners, etc. (a sense now obsolete), from Latin incorrectus "uncorrected, not revised," from in- "not" (see in- (1)) + correctus, past participle of corrigere "to put straight; to reform" (see correct (v.)). Sense of "not in good style" is from 1670s; that of "factually wrong, erroneous, inaccurate" is from 1750s (implied in incorrectly).
incorrigibility (n.) Look up incorrigibility at Dictionary.com
late 15c., from incorrigible + -ity.
incorrigible (adj.) Look up incorrigible at Dictionary.com
mid-14c., "incurable (of diseases, venom, etc.); extravagant (of expense); implacable (of hearts)," from Old French incorrigible "perfect, beyond rebuke or discipline" (14c.) or directly from Latin incorrigibilis "not to be corrected," from in- "not, opposite of" (see in- (1)) + corrigibilis, from corrigere "to correct" (see correct (v.)). From mid-15c. as "incapable of improvement" (of persons). Related: Incorrigibly. As a noun, from 1746.
incorruptibility (n.) Look up incorruptibility at Dictionary.com
mid-15c., from Late Latin incorruptibilitas, from incorruptibilis (see incorruptible).
incorruptible (adj.) Look up incorruptible at Dictionary.com
mid-14c., in a physical sense, from Old French incorruptible (14c.), or directly from Late Latin incorruptibilis "incorruptible," from Latin incorruptus "unspoiled, unseduced," from in- "not" (see in- (1)) + corruptus (see corrupt (adj.)). From 1660s in English in a moral sense. Related: Incorruptibly.
increase (n.) Look up increase at Dictionary.com
late 14c., "action of increasing; results of an increasing," from increase (v.) or from verbs formed from the noun in Old French or Anglo-French. The stress shifted from 18c. to distinguish it from the verb.
increase (v.) Look up increase at Dictionary.com
mid-14c., encresen, "become greater in size or number" (intransitive); late 14c., "cause to grow, enlarge" (transitive), from Anglo-French encress-, Old French encreiss-, present participle stem of encreistre, from Latin increscere "to increase, to grow upon, grow over, swell, grow into," from in- "in" (see in- (2)) + crescere "to grow" (see crescent). Modern English restored the Latin spelling 16c. Related: Increased; increasing.
increasingly (adv.) Look up increasingly at Dictionary.com
late 14c., from increasing (see increase (v.)) + -ly (2).
incredible (adj.) Look up incredible at Dictionary.com
early 15c., "unbelievable, surpassing belief as to what is possible," from Latin incredibilis "not to be believed, extraordinary," from in- "not" (see in- (1)) + credibilis "worthy of belief" (see credible). Used c. 1400 in a now-extinct sense of "unbelieving, incredulous." Related: Incredibly; incredibility.
incredulity (n.) Look up incredulity at Dictionary.com
"disbelieving frame of mind," early 15c., from Middle French incrédulité, from Latin incredulitatem (nominative incredulitas) "unbelief," noun of quality from incredulus "unbelieving" (see incredulous).
incredulous (adj.) Look up incredulous at Dictionary.com
"unbelieving," 1570s, from Latin incredulus "unbelieving, incredulous," from in- "not" (see in- (1)) + credulus (see credulous). Formerly also of religious beliefs. Related: Incredulously; incredulousness.
increment (n.) Look up increment at Dictionary.com
mid-15c., "act or process of increasing," from Latin incrementum "growth, increase; an addition," from stem of increscere "to grow in or upon" (see increase (v.)). Meaning "amount of increase" first attested 1630s.
incremental (adj.) Look up incremental at Dictionary.com
1715, from increment + -al (1). Related: Incrementally.
increpation (n.) Look up increpation at Dictionary.com
"a chiding, a rebuking, censure," c. 1500, from Late Latin increpationem (nominative increpatio), noun of action from past participle stem of Latin increpare "to make noise at, scold, nag, upbraid," from in- "in" (see in- (2)) + crepare "to creak" (see raven (n.)).
incriminate (v.) Look up incriminate at Dictionary.com
1730, back-formation from incrimination (q.v.) or else from Medieval Latin incriminatus, past participle of incriminare "to incriminate, accuse." Related: Incriminated; incriminating.
incrimination (n.) Look up incrimination at Dictionary.com
1650s, noun of action from Medieval Latin incriminare "to incriminate, accuse," from in- "in" (see in- (2)) + criminare "to accuse of a crime," from crimen (genitive criminis) "crime" (see crime).
incroyable (n.) Look up incroyable at Dictionary.com
1796, from French incroyable, literally "incredible" (15c.), from in- "not, opposite of, without" (see in- (1)) + croire "to believe," from Latin credere (see credo). A name for the French fop or dandy of the period of the Directory (1795-99). Said to be so called from their extravagant dress, and also, according to OED, from a favorite expression among them ("C'est vraiment incroyable").
incrustation (n.) Look up incrustation at Dictionary.com
in early use also also encrustation, 1640s, from French encrustation, incrustation, from encruster (see encrust). Or perhaps from the obsolete English verb incrustate, which is attested from 1560s.
incubate (v.) Look up incubate at Dictionary.com
1640s (transitive), "to brood upon, watch jealously" (figurative); 1721 in literal sense "to sit on (eggs) to hatch them," from Latin incubatus, past participle of incubare "to lie in or upon," also in the figurative sense "brood" (see incubation). Intransitive sense "to sit upon eggs" is from 1755. Related: Incubated; incubating.
incubation (n.) Look up incubation at Dictionary.com
1610s, "a brooding," from Latin incubationem (nominative incubatio) "a laying upon eggs," noun of action from past participle stem of incubare "to hatch," literally "to lie on, rest on," from in- "on" (see in- (2)) + cubare "to lie" (see cubicle). The literal sense of "sitting on eggs to hatch them" in English is first recorded 1640s.
incubator (n.) Look up incubator at Dictionary.com
"apparatus for hatching eggs by artificial heat," 1845, agent noun from incubate (v.). Late Latin incubator meant "one who lies in a place."
incubus (n.) Look up incubus at Dictionary.com
"imaginary being or demon, credited with causing nightmares, and, in male form, consorting with women in their sleep," c. 1200, from Late Latin incubus (Augustine), from Latin incubo "nightmare, one who lies down on (the sleeper)," from incubare "to lie upon" (see incubate). Plural is incubi. Compare succubus.
inculcate (v.) Look up inculcate at Dictionary.com
1540s, from Latin inculcatus, past participle of inculcare "force upon, insist; stamp in, impress, tread down," from in- "in" (see in- (2)) + calcare "to tread, press in," from calx (1) "heel" (see calcaneous). Related: Inculcated; inculcating.
inculcation (n.) Look up inculcation at Dictionary.com
1550s, from inculcate (v.), or else Late Latin inculcationem (nominative inculcatio), noun of action from past participle stem of inculcare "to force upon; stamp in."
inculpable (adj.) Look up inculpable at Dictionary.com
late 15c., from Late Latin inculpabilis "unblamable," from in- "not, opposite of" (see in- (1)) + culpabilis (see culpable).
inculpate (v.) Look up inculpate at Dictionary.com
1799, "to accuse, bring charges against," from Medieval Latin inculpatus, past participle of inculpare "to reproach, blame, censure," from Latin in- "in" (see in- (2)) + culpare "to blame," from culpa "fault." But inculpable (late 15c.) means "not culpable, free from blame," from Latin in- "not" (see in- (1)) + culpare.
inculpation (n.) Look up inculpation at Dictionary.com
"incrimination," 1798, noun of action from inculpate (v.). Perhaps from or modeled on French inculpation (18c.).
incumbency (n.) Look up incumbency at Dictionary.com
"state of being an incumbent," c. 1600, from incumbent + -cy.
incumbent (adj.) Look up incumbent at Dictionary.com
1560s, in relation to duties or obligations, from Medieval Latin incumbentem (nominative incumbens), present participle of incumbere (see incumbent (n.)). The literal, physical sense "lying or resting on something" is rare in English and first attested 1620s.
incumbent (n.) Look up incumbent at Dictionary.com
early 15c., "person holding a church position," from Medieval Latin incumbentem (nominative incumbens) "holder of a church position," noun use of present participle of incumbere "to obtain or possess," from Latin incumbere "recline on," figuratively "apply oneself to," from in- "on" (see in- (2)) + -cumbere "lie down," related to cubare "to lie" (see cubicle). Extended to holders of any office from 1670s.
incumbrance (n.) Look up incumbrance at Dictionary.com
see encumbrance.
incunabula (n.) Look up incunabula at Dictionary.com
"swaddling clothes," also, figuratively, "childhood, beginnings, place where a thing had its earliest development," 1824, from Latin incunabula (neuter plural) "a cradle; a birthplace," figuratively "rudiments or beginnings," from in- "in" (see in- (2)) + cunabula, diminutive of cunae "cradle," from PIE *koi-na-, from root *kei- "to lie; bed, couch" (see cemetery).
incunabulum (n.) Look up incunabulum at Dictionary.com
1861, singular of Latin incunabula "cradle, birthplace; rudiments or beginnings" (see incunabula); taken up (originally in German) as a word for any book printed late 15c., in the infancy of the printer's art.
incur (v.) Look up incur at Dictionary.com
c. 1400, "bring (an undesirable consequence) upon oneself;" mid-15c. as "become liable for (payment or expenses)," from Anglo-French encurir, Old French encorir "to run, flee; commit, contract, incur" (Modern French encourir), from Latin incurrere "run into or against, rush at, make an attack;" figuratively, "to befall, happen, occur to," from in- "upon" (see in- (2)) + currere "to run" (see current (adj.)). Related: Incurred; incurring.
incurable (adj.) Look up incurable at Dictionary.com
mid-14c., from Old French incurable "not curable" (13c.), from Late Latin incurabilis "not curable," from in- "not" (see in- (1)) + curabilis "curable" (see curable). As a noun, "incurable person," from 1650s. Related: Incurably.
incurious (adj.) Look up incurious at Dictionary.com
1560s, "negligent, heedless," from Latin incuriosus "careless, negligent, unconcerned," from in- "not, opposite of, without" (see in- (1)) + curiosus (see curious). Meaning "uninquisitive" is from 1610s. Objective sense of "unworthy of attention" is from 1747. Related: Incuriously. Incuriosity is attested from c. 1600.
incursion (n.) Look up incursion at Dictionary.com
"hostile attack," early 15c., from Old French incursion "invasion, attack, assault" (14c.) or directly from Latin incursionem (nominative incursio) "a running against, hostile attack," noun of action from past participle stem of incurrere "run into or against, rush at" (see incur).
incus (n.) Look up incus at Dictionary.com
middle ear bone, 1660s, from Latin incus "anvil," from incudere "to forge with a hammer," from in- "in" + cudere "to strike, beat," from PIE *kau-do-, suffixed form of root *kau- "to hew, strike" (see hew). The bone so called by Belgian anatomist Andreas Vesalius (1514-1564).
indear (v.) Look up indear at Dictionary.com
see endear.
indearing (adj.) Look up indearing at Dictionary.com
see endearing.
indebted (adj.) Look up indebted at Dictionary.com
late 14c., endetted "owing money, liable for borrowed money," past participle of endetten "to indebt, oblige," from Old French endeter "to involve in debt, run into debt," from en- "in" (see in- (2)) + dete "debt" (see debt). Figurative sense of "under obligation for favors or services" first attested 1560s. Spelling re-Latinized in English from 16c. The verb indebt is now rare or obsolete. Related: Indebtedness. Latin indebitus meant "not owed, not due."
indecency (n.) Look up indecency at Dictionary.com
1580s, "outrageous conduct," from Latin indecentia "unseemliness, impropriety," noun of quality from indecentem "unbecoming" (see indecent). Now especially of conduct which violates recognized standards of propriety (1690s).
indecent (adj.) Look up indecent at Dictionary.com
1560s, "unbecoming, in bad taste," from French indécent (14c.) or directly from Latin indecentem (nominative indecens) "unbecoming, unseemly," from in- "not, opposite of, without" (see in- (1)) + decens (see decent). Sense of "offending against propriety" is from 1610s. Indecent assault (1861) originally covered sexual assaults other than rape or intended rape, but by 1934 it was being used as a euphemism for "rape." Related: Indecently
indecipherable (adj.) Look up indecipherable at Dictionary.com
1802, from in- (1) "not" + decipherable (see decipher (v.)). Undecipherable is older. Related: Indecipherably; indecipherability.
indecision (n.) Look up indecision at Dictionary.com
1735, from in- (1) "not, opposite of, without" + decision. Perhaps from or modeled on French indécision (17c.), which Cotgrave's "French and English Dictionary" (1673) translates with An undecision.
indecisive (adj.) Look up indecisive at Dictionary.com
1726, "inconclusive," from in- (1) "not, opposite of" + decisive. Meaning "vacillating, characterized by indecision" is from 1787. Related: Indecisively; indecisiveness.
indeclinable (adj.) Look up indeclinable at Dictionary.com
late 14c., originally in grammar, from French indéclinable or directly from Latin indeclinabilis "unchangeable," also in grammar, from indeclinatus "unchanged, constant," from in- "not, opposite of" (see in- (1)) + declinatus, from declinare "to lower; avoid, deviate; bend from, inflect" (see decline (v.)). Related: Indeclinably.