~ 1922 ~
"The Meaning of Relativity: Four Lectures Delivered at Princeton University, May 1921" is a book published by Princeton University Press in 1922 that compiled the 1921 Stafford Little Lectures at Princeton University, given by Albert Einstein. The lectures follow a series of 1915 publications by Einstein developing the theory of general relativity. The book aims to summarize the principal thoughts and mathematical methods of relativity theory. It is Einstein's only book that provides an accessible overview of the physics and mathematics of general relativity. The book is also the subject of "The Formative Years of Relativity" by Hanoch Gutfreund and Jürgen Renn.