[from plagiary plagiarist, from Latin plagiarius , literally, kidnapper, from plagium netting of game, kidnapping, from plaga net]
: to copy and pass off (the expression of ideas or words of another) as one's own
: use (another's work) without crediting the source [the book contained plagiarized material "Smith v. Little, Brown & Co., 265 F. Supp. 451 (1965)"]
: to present as new and original an idea or work derived from an existing source
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.