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.
After the fixed-rate period ends, an ARM's interest rate moves up and down with another interest rate, called the index. The index is an interest rate set by market forces and published by a neutral party. There are many indexes, and the loan paperwork identifies which index a particular ARM follows.