### Question
How is the term index defined?


### Answer
The term **index** is defined in *15 U.S.C. § 78c* as the following:

> an index or group of securities, including any interest therein or based on the value thereof

#### Citation:
  - *15 U.S.C. § 78c*
  - Heading: **CHAPTER 2B-SECURITIES EXCHANGES**

