central

The word "central" is most commonly used as an adjective to describe location or importance. When describing a place, it often means that the area is convenient for travel. When using "central" to mean "most important," it is often interchangeable with words like "key" or "principal." For example, a "central theme" is the main idea of a story. In political contexts, "central" usually refers to a national authority (like a central government) as opposed to local or regional authorities.