What is this modern-day phenomenon that has spread like poison ivy through the ranks of novelists, historians, academics, scientists, students and almost anyone who uses and publishes words?

Plagiarism is a species of intellectual fraud that an author claims is original but has been copied from another source without permission or acknowledgment, thus deceiving and harming the reader.

I just committed plagiarism.

From the archive:

The Ecstasy of Influence, by Johnathan Lethem