1. (

• index

) a numerical scale used to compare variables with one another or with some reference number ;

2. (

• 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 ;

3. (

• exponent ,
• power ,
• index ,

) a mathematical notation indicating the number of times a quantity is multiplied by itself ;

4. (

• index

) an alphabetical listing of names and topics along with page numbers where they are discussed ;

5. (

• index ,
• index_finger ,
• forefinger

) the finger next to the thumb ;