Here is an additional book to add to your professional book shelf. Having a good dictionary can be very useful for mechanical engineers although it’s not as important as rest of the books mentioned here. Dictionary of Mechanical Engineering is a well written book that comes with definitions for over 4500 terms in its fourth edition. This is a very good reference especially for professional examinations related to mechanical engineering. The author of Dictionary of Mechanical Engineering is G.H.F. Nayler and this 462 page book is available at Amazon website