import (v.)youdaoicibaDictYouDict[import 词源字典]
early 15c., "convey information, express, make known, signify," from Latin importare "bring in, convey," from assimilated form of in- "into, in" (see in- (2)) + portare "to carry" (see port (n.1)). Sense of "bring in goods from abroad" first recorded c. 1500. Related: Imported; importing.[import etymology, import origin, 英语词源]
import (n.)youdaoicibaDictYouDict
"consequence, importance," 1580s; sense of "that which is imported" is from 1680s; both from import (v.).
importance (n.)youdaoicibaDictYouDict
c. 1500, from Middle French importance or directly from Medieval Latin importantia, from importantem (see important).
important (adj.)youdaoicibaDictYouDict
mid-15c., from Middle French important and directly from Medieval Latin importantem (nominative importans), present participle of importare "be significant in," from Latin importare "bring in" (see import). Related: Importantly.
importation (n.)youdaoicibaDictYouDict
c. 1600; see import (v.) + -ation.
importunate (adj.)youdaoicibaDictYouDict
1520s, from importune + -ate, or else from Medieval Latin importunatus, past participle of importunari. Related: Importunately (mid-15c.).
importune (v.)youdaoicibaDictYouDict
1520s, back-formation from importunity, or else from Middle French importuner, from Medieval Latin importunari "to make oneself troublesome," from Latin importunus "unfit, troublesome," originally "having no harbor" (i.e. "difficult to access"), from assimilated form of in- "not, opposite of" (see in- (1)) + portus "harbor" (see port (n.1)). Related: Importuned; importuning. As an adjective from early 15c.
importunity (n.)youdaoicibaDictYouDict
early 15c., "persistence, insistence; over-eagerness," from Middle French importunité (14c.), from Latin importunitatem (nominative importunitas) "unsuitableness; unmannerliness, incivility," from importunus "unfit, troublesome" (see importune).
impose (v.)youdaoicibaDictYouDict
late 14c., "to lay (a crime, etc.) to the account of," from Old French imposer "put, place; impute, charge, accuse" (c. 1300), from assimilated form of in- "into, in" (see in- (2)) + poser "put, place" (see pose (v.1)). Sense of "to lay on as a burden" first recorded 1580s. Related: Imposed; imposing.
imposing (adj.)youdaoicibaDictYouDict
"that impresses by appearance or manner," 1786, from present participle of impose (v.). Related: Imposingly.
imposition (n.)youdaoicibaDictYouDict
late 14c., "the levying of taxes, a tax, duty, tribute," from Old French imposicion "tax, duty; a fixing" (early 14c.), from Latin impositionem (nominative impositio) "a laying on," from imponere "to place upon," from assimilated form of in- "into, in" (see in- (2)) + ponere "to put, place" (past participle positus; see position (n.)). Sense of "the act of putting (something) on (something else)" is from 1590s. Meaning "an act or instance of imposing" (on someone) first recorded 1630s (see impose).
impossibility (n.)youdaoicibaDictYouDict
late 14c., "quality of being impossible," from impossible + -ity; perhaps from or modeled on French impossibilité. Meaning "an impossible thing or occurrence" is from c. 1500.
impossible (adj.)youdaoicibaDictYouDict
late 14c., from Old French impossible, from Latin impossibilis "not possible," from assimilated form of in- "not, opposite of" (see in- (1)) + possibilis (see possible). Related: Impossibly.
impost (n.)youdaoicibaDictYouDict
"tax, duty," 1560s, from Middle French impost, from Medieval Latin impostum, from neuter of Latin impostus, contracted from impositus, past participle of imponere (see impostor).
impostor (n.)youdaoicibaDictYouDict
1580s, from Middle French imposteur (16c.), from Late Latin impostor, agent noun from impostus, collateral form of impositus, past participle of imponere "place upon, impose upon, deceive," from assimilated form of in- "into, in, on, upon" (see in- (2)) + ponere "to put place" (past participle positus; see position (n.)).
imposture (n.)youdaoicibaDictYouDict
"act of willfully deceiving others," 1530s, from Middle French imposture, from Late Latin impostura, from impostus (see impost).
impotence (n.)youdaoicibaDictYouDict
early 15c., "physical weakness," also "poverty," from Middle French impotence "weakness," from Latin impotentia "lack of control or power," from impotentem (nominative impotens); see impotent. In reference to a want of (male) sexual potency, from c. 1500. The figurative senses of the word in Latin were "violence, fury, unbridled passion." Related: Impotency.
impotent (adj.)youdaoicibaDictYouDict
late 14c., "physically weak, enfeebled, crippled," from Old French impotent "powerless, weak, incapable," from Latin imponentem (nominative impotens) "lacking control, powerless," from assimilated form of in- "not, opposite of" (see in- (1)) + ponentem (nominative potens) "potent" (see potent).

Meaning "having no power to accomplish anything" is from mid-15c.; that of "completely lacking in sexual power" (of males) is from mid-15c. Middle English also had a native term for this: Cunt-beaten (mid-15c.). The figurative sense in Latin was "without self-control, headstrong, violent." Related: Impotently.
impound (v.)youdaoicibaDictYouDict
early 15c., "to shut up in a pen or pound," from assimilated form of in- "into, in" (see in- (2)) + pound (n.). Originally of cattle seized by law. Related: Impounded; impounding.
impoundment (n.)youdaoicibaDictYouDict
1660s; see impound + -ment.