innuendo (n.)youdaoicibaDictYouDict[innuendo 词源字典]
1670s, "oblique hint, indiscreet suggestion," usually a deprecatory one, from Latin innuendo "by meaning, pointing to," literally "giving a nod to," ablative of gerund of innuere "to mean, signify," literally "to nod to," from in- "at" + nuere "to nod" (see numinous). Originally a legal phrase (1560s) from Medieval Latin, with the sense of "to wit." It often introduced the derogatory meaning alleged in libel cases, which influenced its broader meaning. As a verb, from 1706.[innuendo etymology, innuendo origin, 英语词源]
InnuityoudaoicibaDictYouDict
1765, from Inupiaq Eskimo inuit "people," plural of inuk "man, person."
innumerable (adj.)youdaoicibaDictYouDict
mid-14c., from Latin innumerabilis "countless, immeasurable," from in- "not" (see in- (1)) + numerabilis "able to be numbered," from numerare "to count, number," from numerus "a number" (see number (n.)).
inobservant (adj.)youdaoicibaDictYouDict
1660s, from Latin inobservantem (nominative inobservans) "inattentive, negligent," from in- "not" (see in- (1)) + observans (see observance).
inoculate (v.)youdaoicibaDictYouDict
mid-15c., "implant a bud into a plant," from Latin inoculatus, past participle of inoculare "graft in, implant," from in- "in" (see in- (2)) + oculus "bud," originally "eye" (see eye (n.)). Meaning "implant germs of a disease to produce immunity" first recorded (in inoculation) 1714, originally in reference to smallpox. After 1799, often used in sense of "to vaccine inoculate." Related: Inoculated; inoculating.
inoculation (n.)youdaoicibaDictYouDict
mid-15c. in horticulture; 1714 in pathology, from Latin inoculationem (nominative inoculatio) "an engrafting, budding," noun of action from past participle stem of inoculare (see inoculate).
inoffensive (adj.)youdaoicibaDictYouDict
1590s, from in- (1) "not, opposite of" + offensive. Related: Inoffensively; inoffensiveness.
inoperable (adj.)youdaoicibaDictYouDict
1856, from in- (1) "not, opposite of" + operable.
inoperative (adj.)youdaoicibaDictYouDict
1630s, from in- (1) "not, opposite of" + operative.
inopportune (adj.)youdaoicibaDictYouDict
1530s, from Late Latin inopportunus "unfitting," from in- "not" + opportunus (see opportune). A rare word before 19c. Related: Inopportunely.
inordinate (adj.)youdaoicibaDictYouDict
late 14c., "not ordered, lacking order or regularity," from Latin inordinatus "unordered, not arranged," from in- "not, opposite of" (see in- (1)) + ordinatus, past participle of ordinare "to set in order" (see order). Sense of "immoderate, excessive" is from notion of "not kept within orderly limits." Related: Inordinately; inordinateness.
inorganic (adj.)youdaoicibaDictYouDict
1794, "without organized organic structure," from in- (1) "not, opposite of" + organic. Sense of "not arriving by natural growth" recorded from 1862.
inpatientyoudaoicibaDictYouDict
1760 (n.); 1959 (adj.), from in + patient.
input (n.)youdaoicibaDictYouDict
1793, "a sum (of cash) put in," from in + put. Computing sense of "data fed into a machine" is from 1948; the verb in the computing sense is attested from 1946. There was a Middle English verb input (late 14c.) meaning "to put in, place, set," but it died out long before this.
inquest (n.)youdaoicibaDictYouDict
late 13c., an-queste "legal or judicial inquiry," from Old French enqueste "inquiry," from Vulgar Latin *inquaestia (source also of Italian inchiesta), from fem. past participle of Vulgar Latin *inquirere "inquire" (see inquire).
inquire (v.)youdaoicibaDictYouDict
late 13c., from Old French enquerre "ask, inquire about" (Modern French enquérir), from Vulgar Latin *inquaerere, from Latin in- "into" (see in- (2)) + quaerere "ask, seek" (see query (v.)). Respelled 14c. on Latin model, but half-Latinized enquire still persists. Related: Inquired; inquiring; inquiringly.
inquirer (n.)youdaoicibaDictYouDict
1560s, "one who inquires," agent noun from inquire.
inquiry (n.)youdaoicibaDictYouDict
mid-15c., enquery, from enquere (see inquire). Respelled from mid-16c. to conform to Latin.
inquisition (n.)youdaoicibaDictYouDict
late 14c., "judicial investigation, act or process of inquiring," from Old French inquisicion "inquiry, investigation" (12c.), from Latin inquisitionem (nominative inquisitio) "a searching into, legal examination," noun of action from past participle stem of inquirere (see inquire).

In Church history, inquisitors were appointed from 382 C.E. to root out heretics, and the Inquisition refers to the ecclesiastical court (Congregation of the Holy Office) appointed 13c. by Innocent III to suppress heresy. It never operated in Britain. The capital letter form appeared in English only after c. 1500, and usually refers to the office's reorganization 1478-1483 in Spain as what is commonly called the Spanish Inquisition.
inquisitive (adj.)youdaoicibaDictYouDict
late 14c., from Old French inquisitif, from Late Latin inquisitivus "making inquiry," from Latin inquisit-, past participle stem of inquirere (see inquire).
An housbonde shal nat been Inquisityf of goddes pryuetee nor of his wyf. [Chaucer, "Miller's Prologue"]
Related: Inquisitively; inquisitiveness.