What is Theft?

Legal Definition
In common usage, theft is the taking of another person's property or services without that person's permission or consent with the intent to deprive the rightful owner of it. The word is also used as an informal shorthand term for some crimes against property, such as burglary, embezzlement, larceny, looting, robbery, shoplifting, library theft, and fraud (i.e., obtaining money under false pretenses). In some jurisdictions, theft is considered to be synonymous with larceny; in others, theft has replaced larceny. Someone who carries out an act of or makes a career of theft is known as a thief. The act of theft is also known by other terms such as stealing, thieving, and filching.

Theft is the name of a statutory offence in California, Canada, England and Wales, Hong Kong, Northern Ireland, Ireland, Victoria (Australia) and South Australia.
-- Wikipedia
Legal Definition
Crimes. This word is sometimes used as synonymous with larceny, (q. v.) but it is not so technical. Ayliffe's Pand. 581 2 Swift's Dig. 309.

2. In the Scotch law, this is a proper and technical word, and signifies the secret and felonious abstraction of the property of another for sake of lucre, without his consent. Alison, Princ. Cr. Law of Scotl. 250.
-- Bouviers Law Dictionary
Legal Definition
An unlawful felonious inking away of another man's movable and personal goods against the wlll of the owner. Jacob. Theft is the fraudulent taking of corporeal ersonal property belonging to another, from is possession, or from the possession of some person holding the same for him, without his consent, with intent to deprive the owner of the value of the same, and to appropriate it to the use or benefit of the person taking. Quit-zow v. State, 1 Tex. App. 65, 28 Am. Rep. 396; Mullins v. State, 37 Tex. 338; U. S. v. Thomas (D. C.) 69 Fed. 590; People v. Donohue, 84 N. Y. 442. In Scotch law. The secret and felonious abstraction of the property of another for sake of lucre, without his consent. Alls. Crim. Law, 250.
-- Black's Law Dictionary
Legal Definition
Larceny. But by statute it includes other crimes in Texas. See Pen. Code Tex. 1895, art. 858.
-- Ballentine's Law Dictionary