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Children's Dictionary
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improvement the act of improving or the condition of being improved. [2 definitions]
improvise to make up while one is performing; perform without planning or practice. [2 definitions]
impudent not showing respect; bold and rude.
impulse a sudden wish or desire that makes a person want to do something. [2 definitions]
impulsive acting without thinking or planning. [2 definitions]
impure mixed with something that is harmful; polluted or not pure.
IN an abbreviation for Indiana.
in surrounded or contained by; living or located at. [7 definitions]
in-1 a prefix that means "in," "on," or "into."
in-2 a prefix that means "not" or "without."
inability lack of ability or power to do something.
inaccurate not correct, true, or exact.
inadequate not enough; not good enough.
in advance before or early.
in any event no matter what happens; in any case.
inappropriate not right or proper for the time or place; not appropriate.
inaudible impossible to hear.
inaugurate to put in office with an official ceremony. [2 definitions]
inauguration a formal beginning or start.
inborn in a person at birth; not learned.
Inca a member of one of the Indian peoples that ruled Peru before being conquered by Spain in the sixteenth century.