| Noun | 1. | index - a numerical scale used to compare variables with one another or with some reference number | |
| 2. | index - 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 timefact - a statement or assertion of verified information about something that is the case or has happened; "he supported his argument with an impressive array of facts" business index - a statistical compilation that provides a context for economic or financial conditions; "this business index is computed relative to the base year of 1995" leading indicator - one of 11 indicators for different sections of the economy; used by the Department of Commerce to predict economic trends in the near future price index, price level - an index that traces the relative changes in the price of an individual good (or a market basket of goods) over time | |
| 3. | index - a mathematical notation indicating the number of times a quantity is multiplied by itselfdegree - the highest power of a term or variable logarithm, log - the exponent required to produce a given number | |
| 4. | index - an alphabetical listing of names and topics along with page numbers where they are discussedkey word - a significant word used in indexing or cataloging list, listing - a database containing an ordered array of items (names or topics) concordance - an index of all main words in a book along with their immediate contexts | |
| 5. | index - the finger next to the thumbfinger - any of the terminal members of the hand (sometimes excepting the thumb); "her fingers were long and thin" | |
| Verb | 1. | index - list in an indexlist - include in a list; "Am I listed in your register?" cross-index - make an index that refers from one point to the next; "These references are cross-indexed" | |
| 2. | index - provide with an index; "index the book" | |
| 3. | index - adjust through indexation; "The government indexes wages and prices" | |