What it means

1. noun the finger next to the thumb
2. noun an alphabetical listing of names and topics along with page numbers where they are discussed
3. noun a number or ratio (a value on a scale of measurement) derived from a series of observed facts
4. noun a numerical scale used to compare variables with one another or with some reference number
5. noun a mathematical notation indicating the number of times a quantity is multiplied by itself
6. verb adjust through indexation
   “The government indexes wages and prices”
7. verb provide with an index
   “index the book”
8. verb list in an index