1. An alphabetical listing of names and topics along with page numbers where they are discussed
   "The student used the book's index to quickly find information on specific topics"
    
2. A numerical scale used to compare variables with one another or with some reference number
   "The consumer price index is used to measure inflation"
    
3. 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
   "Economists use index numbers to track changes in the cost of living";
   - index number, indicant, indicator
    
4. A mathematical notation indicating the number of times a quantity is multiplied by itself
   "The index in x⁴ is 4";
   - exponent, power
    
5. The finger next to the thumb
   "She pointed with her index finger";
   - index finger, forefinger

1. (publication) provide with an index
   "index the book"
    
2. List in an index
   "The librarian indexed the new acquisitions"
    
3. Adjust through indexation
   "The government indexes wages and prices"

Derived forms: indices, indexing, indexed, indexes

Type of: determine, fact, finger, furnish, graduated table, influence, list, listing, mathematical notation, mold [N. Amer], mould [Brit, Cdn], offer, ordered series, provide, regulate, render, scale, scale of measurement, shape, supply

Part of: back matter, end matter

Encyclopedia: Index, Virginia