The act or an instance of stealing; larceny.(noun)
Obsolete Something stolen.(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 "theft" in a sentence
"You are misusing the term theft, as the rightful owner of internet pipes are the owners of internet pipes, not you or me."
"Let's start with infringement / theft - your issue with the term theft is that the original isn't stolen, only a copy."
"The label theft of land appears quite satisfactory."