Unlike other engineering dictionaries that tend to focus only on narrow and arcane technical words, this dictionary explains the major, commonly used words found in engineering documents and drawings, and explains them in plain, unambiguous English. It also explains how some terms take on different meanings in different engineering contexts - vital when working on collaborative projects across different engineering disciplines. This work is based on a dictionary that was developed for engineers and technicians at Lockheed Martin. Each definition is written in clear, everyday English to avoid confusing jargon and 'techno-speak' problems.