Noun

• S: (n) index (a numerical scale used to compare variables with one another or with some reference number)
• S: (n) index, index number, indicant, indicator (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)
• S: (n) exponent, power, index (a mathematical notation indicating the number of times a quantity is multiplied by itself)
• S: (n) index (an alphabetical listing of names and topics along with page numbers where they are discussed)
• S: (n) index, index finger, forefinger (the finger next to the thumb)

Verb

• S: (v) index (list in an index)
• S: (v) index (provide with an index) "index the book"
• S: (v) index (adjust through indexation) "The government indexes wages and prices"