Index definition

noun

(1) The finger next to the thumb

(2) An alphabetical listing of names and topics along with page numbers where they are discussed

(3) A number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time

(4) A mathematical notation indicating the number of times a quantity is multiplied by itself

(5) A numerical scale used to compare variables with one another or with some reference number

verb

(6) Adjust through indexation

"The government indexes wages and prices"

(7) Provide with an index

"Index the book"

(8) List in an index