Book excerpt: " ... Provides concise definitions of the words and terms used in the new public discourse on American homeland security and defense. Its purposes are: to document the language of homeland security and defense, to clarify the meanings conveyed through this language, to provide a common reference for the words and terms of homeland security and defense, to facilitate communication, and ultimately consensus, across the realm of homeland security and defense, [and] to support the daily transactions of all those within, affected by, or having an interest in homeland security and defense" -- Preface.