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infinitive in grammar, the form of a verb that is unmarked for person, tense, or aspect, and that functions as a noun, adjective, or complement, such as "to leave" in "To leave now would be a mistake". [2 definitions]
infinity the character or condition of being infinite. [5 definitions]
infirm weak or ill, as from old age. [2 definitions]
inflame to excite, arouse, or intensify (the emotions or passions). [4 definitions]
inflammable capable of catching fire and burning, or easy to set aflame and burn; flammable. [2 definitions]
inflammation the act or an instance of being inflamed. [2 definitions]
inflate to enlarge, expand, or distend. [5 definitions]
inflation an increase in the average price level. [2 definitions]
inflection a change in the pitch or tone of a voice; modulation. [5 definitions]
inflexible not capable of being bent, or not easy to bend; rigid. [3 definitions]
inflict to strike or administer in a physical assault. [2 definitions]
influence the power or intangible action of one thing or person which brings about an effect on another. [4 definitions]
influential having authority or influence.
influenza an acute, contagious disease in various forms, caused by a virus in humans and in some animals and characterized by inflammation of the respiratory tract, irritation of the stomach, and fever; flu.
info shortened form of "information."
infomercial a long commercial in the form of a television program.
inform to communicate knowledge to; tell. [4 definitions]
informal not formal or ceremonious; casual. [3 definitions]
information knowledge or facts that come from investigation, observation, or study. [4 definitions]
infrastructure the basic facilities and equipment, esp. of a technological nature, that are necessary for a system or organization to function.
infrequent happening seldom or at long intervals. [3 definitions]