Floridaâs tract of coral reefs has the honor of being the third-largest barrier reef ecosystem in the world. However, it could soon be a thing of the past, as the acidification of the oceanâs water is dissolving it faster than it can rebuild.
index (plural indexes or indices) 1  An alphabetical listing of items and their location. The index of a book lists words or expressions and the pages of the book upon which they are to be found. 2  The index finger; the forefinger. 3  A movable finger on a gauge, scale, etc.
1. An index is a method of sorting data by creating keywords or a listing of the data. A great example of an index of Computer Hope's hardware listing. 2. When referring to the Internet or web pages, an index is a file named as index.htm, index.html, index.asp, or index.php. The index file is the first file loaded when accessing a directory on a website.