Learner's definition of READER
1 : a person who reads a book, magazine, newspaper, etc.
— often + of
The book's ending leaves readers to draw their own conclusions.
She's a fast/slow/avid/voracious reader.
He's not much of a reader. [=he doesn't enjoy reading books, magazines, etc.]
a magazine with three million readers
2 : a machine that is used for reading text or information that is stored on film, tape, etc.
a microfilm reader
a card reader
3 : a book that is used to learn how to read or to practice reading in your own language or in a foreign language 4 British
orReader : a teacher at a university who ranks just below a professor