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Ronald Hanifan, who is the author of the present publication, made his best trying to provide as many as possible common words as well as terminology used throughout the engineering community together with their definitions. These words are commonly approved and recognized definitions extracted from appropriate sources such as specifications, standards, handbooks, and consolidated into single volume. Please note that it is critically important to have a clear understanding of the definitions being in use use in engineering because often terms, words and their meanings get misapplied or intermixed. Many of them are used in various engineering documents, drawings, communications, contracts, technical orders, technical manuals, specifications and purchase orders, as well as all numerous documents relating to the engineering field. As these words form some kind of legal agreement, when there are used improperly, this may easily result in repercussions. Notes on engineering documents, such as drawings, must be written in concise and short statements with shortest words and phrases to convey the intended meaning. When words or terms are used properly, the intended meaning will be fully and properly understood by the reader. But, should the words or terms be applied incorrectly, this may be disastrous.