What does "e-book" mean?

An electronic book, a book published in electronic form.

E-book

noun

noun ·Rare ·Advanced level

Noun

1
An electronic book, a book published in electronic form.
"The hype around e-books was electrifying in the year 2000 when Stephen King became the first celebrity writer to publish an e-novel."

"I am not the least bit happy with this e-book revolution."

A contraction of electronic book: e- + book.