No person; not anyone: Nobody told you to go. (pronoun)
A person of no importance or influence.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "nobody" in a sentence
""There was nobody -- _nobody_ who had a right to think himself injured by your brother, even long before?""
""Mrs. Matthews says a charwoman and a little girl from the village used to be left alone in the house for months, to play any sort of games, with nobody to look after them -- _nobody_ -- while you were away!""
"Thus, whether Shakspeare were written by nobody or not, it seems pretty well proved that _nobody gave_ the plays to Shakspeare; so that, whether by inheritance, _purchase_, or divine afflatus, the man who wrote Shakspeare was -- William Shakspeare."