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impeachment an act of impeaching, esp. the presentation of formal charges against a public official.
impeccable flawless or blameless; perfect. [2 definitions]
impecunious lacking funds; penniless.
impedance a measure of the total resistance of an electric circuit to an alternating current flow, usu. expressed in ohms.
impede to slow or block the movement or progress of; hinder.
impediment an obstacle or hindrance. [3 definitions]
impedimenta baggage, supplies, or other encumbrances that slow one's progress.
impel to drive or incite to action. [2 definitions]
impeller that which drives or sends forward. [2 definitions]
impend to be about to occur or appear. [2 definitions]
impending about to occur or appear. [2 definitions]
impenetrable impossible to penetrate or enter; impervious. [3 definitions]
impenitent not sorry or apologetic for one's misdeeds; unrepentant.
imperative extremely important; urgent; unavoidable. [6 definitions]
imperative sentence a sentence that tells someone to do something or makes a request. An example of an imperative sentence is "Tie your shoes."
imperator in ancient Rome, a victorious general or an emperor.
imperceptible so gradual or subtle as to be unnoticed or unnoticeable. [2 definitions]
imperceptive having poor perception or understanding.
impercipient combined form of percipient.
imperfect not perfect or complete; having defects or shortcomings. [5 definitions]
imperfection a flaw or fault. [2 definitions]