| imprint | (noun) a device produced by pressure on a surface | - |
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| (noun) a distinctive influence | - |
| (noun) an impression produced by pressure or printing | Synonyms: embossment |
| (noun) an identification of a publisher; a publisher's name along with the date and address and edition that is printed at the bottom of the title page | - |
| (noun) a concavity in a surface produced by pressing | Synonyms: depression, impression |
| imprinting | (noun) a learning process in early life whereby species specific patterns of behavior are established | - |
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| imprisonment | (noun) the act of confining someone in a prison (or as if in a prison) | Synonyms: internment |
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| (noun) putting someone in prison or in jail as lawful punishment | - |
| (noun) the state of being imprisoned | Synonyms: captivity, immurement, incarceration |
| improbability | (noun) the quality of being improbable | Synonyms: improbableness |
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| improbableness | (noun) the quality of being improbable | Synonyms: improbability |
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| impromptu | (noun) an extemporaneous speech or remark | - |
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| (noun) a short musical passage that seems to have been made spontaneously without advance preparation | - |
| improperness | (noun) an improper demeanor | Synonyms: impropriety |
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| impropriety | (noun) an act of undue intimacy | Synonyms: familiarity, indecorum, liberty |
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| (noun) an indecent or improper act | Synonyms: indecency |
| (noun) an improper demeanor | Synonyms: improperness |
| (noun) the condition of being improper | - |
| improvement | (noun) the act of improving something | - |
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| (noun) a change for the better; progress in development | Synonyms: advance, betterment |
| (noun) a condition superior to an earlier condition | Synonyms: melioration |
| improver | (noun) a component that is added to something to improve it | Synonyms: add-on, addition |
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| (noun) someone devoted to the promotion of human welfare and to social reforms | Synonyms: do-gooder, humanitarian |
| improvidence | (noun) a lack of prudence and care by someone in the management of resources | Synonyms: shortsightedness |
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| improvisation | (noun) an unplanned expedient | Synonyms: temporary expedient |
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| (noun) a performance given extempore without planning or preparation | Synonyms: extemporisation, extemporization |
| (noun) a creation spoken or written or composed extemporaneously (without prior preparation) | - |
| imprudence | (noun) a lack of caution in practical affairs | - |
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| impudence | (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impertinence, insolence |
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| (noun) an impudent statement | Synonyms: cheek, impertinence |
| impuissance | (noun) powerlessness revealed by an inability to act | Synonyms: helplessness, weakness |
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| impulse | (noun) the act of applying force suddenly | Synonyms: impetus, impulsion |
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| (noun) an impelling force or strength | Synonyms: momentum |
| (noun) the electrical discharge that travels along a nerve fiber | Synonyms: nerve impulse, nervous impulse, neural impulse |
| (noun) (electronics) a sharp transient wave in the normal electrical state (or a series of such transients) | Synonyms: pulsation, pulse, pulsing |
| (noun) a sudden desire | Synonyms: caprice, whim |
| (noun) an instinctive motive | Synonyms: urge |
| impulsion | (noun) the act of applying force suddenly | Synonyms: impetus, impulse |
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| (noun) a force that moves something along | Synonyms: drift, impetus |
| impulsiveness | (noun) the trait of acting suddenly on impulse without reflection | - |
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| impunity | (noun) exemption from punishment or loss | - |
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| impureness | (noun) the condition of being impure | Synonyms: impurity |
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| impurity | (noun) the condition of being impure | Synonyms: impureness |
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| (noun) worthless or dangerous material that should be removed | Synonyms: dross |
| imputation | (noun) the attribution to a source or cause | - |
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| (noun) a statement attributing something dishonest (especially a criminal offense) | - |