index

(noun) a numerical scale used to compare variables with one another or with some reference number.

(noun) 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. Synonyms: index number, indicant, indicator.

(noun) a mathematical notation indicating the number of times a quantity is multiplied by itself. Synonyms: exponent, power.

(noun) an alphabetical listing of names and topics along with page numbers where they are discussed.

(noun) the finger next to the thumb. Synonyms: index finger, forefinger.

(verb) list in an index.

(verb) provide with an index. Example: "Index the book."

(verb) adjust through indexation. Example: "The government indexes wages and prices."