The act or process of introducing.
A written or oral explanation of what constitutes the basis of an issue.
A means, such as a personal letter, of presenting one person to another.
An initial section of a book or article, which introduces the subject material.
The action or process of preparing something, or preparing for something.
The practice of making active preparations for a possible catastrophic disaster or emergency, typically by stockpiling food, ammunition, and other supplies.