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1 definition by Flanagin

1. used as subject or direct object or indirect object of a verb or object of a preposition usually in reference to a lifeless thing
2. used as subject of an impersonal verb that expresses a condition or action without reference to an agent
3. used to refer to an explicit or implicit state of affairs or circumstances
I am using "it" in a sentence.
by Flanagin January 15, 2003