the act of classifying and providing an index in order to make items easier to retrieve | the finger next to the thumb |
| an alphabetical listing of names and topics along with page numbers where they are discussed |
| 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 |
| a mathematical notation indicating the number of times a quantity is multiplied by itself |
| a numerical scale used to compare variables with one another or with some reference number |