n. the finger next to the thumb

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

n. 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

n. a mathematical notation indicating the number of times a quantity is multiplied by itself

n. a method in programming for keeping track of data in a table

v. adjust through indexation; "The government indexes wages and prices"

v. provide with an index; "index the book"

v. list in an index