Origin: Greek suffix -ism
Plagiarism has 3 different meanings across 1 category:
a piece of writing that has been copied from someone else and is presented as being your own work
"The teacher was furious when she discovered that his essay was nothing but plagiarism, having stolen entire paragraphs from an online article without citing the source."
the act of plagiarizing; taking someone's words or ideas as if they were your own
"The teacher was furious when she discovered that the student had committed plagiarism by copying an entire essay from a website without giving credit."
Copying of another person's ideas, text, or other creative work, and presenting it as one's own, especially without permission; plagiarizing.
"The teacher was furious when she discovered that the student had committed plagiarism by submitting someone else's essay as their own original work."