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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]
imperforate lacking openings or perforations. [3 definitions]
imperial1 of or pertaining to an empire or its ruler. [5 definitions]
imperial2 a small, pointed beard grown on the lower lip and chin.
imperial3 a gold coin formerly minted in Russia worth ten, and later fifteen, rubles.
imperial gallon a British unit of capacity equal to 1.2 U.S. gallons or 4.546 liters.
imperialism the policy of extending the rule or authority of one nation over others by territorial acquisition or through economic or political dominance. [3 definitions]
imperialistic of or pertaining to the rule or authority of one nation over others by territorial acquisition or through economic or political domination. [2 definitions]
imperil to put at risk; endanger.