: to commit literary theft : to present as new and original an idea or product derived from an existing source
"For students today, the lure of plagiarizing and the temptation to cheat might appear overwhelming; it's at the fingertips, at their keyboard." Gina Barreca, PsychologyToday.com blog December 18, 2012
About the Word:
The seriousness of this offense is reflected in the linguistic history of plagiarize: it comes from the noun plagiary, a synonym of plagiarism that originally meant "kidnapper."