1. (noun) index
a numerical scale used to compare variables with one another or with some reference number
2. (noun) 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. (noun) exponent, power, index
a mathematical notation indicating the number of times a quantity is multiplied by itself
4. (noun) index
an alphabetical listing of names and topics along with page numbers where they are discussed
5. (verb) index, index finger, forefinger
the finger next to the thumb
6. (verb) index
list in an index
7. (verb) index
provide with an index
"index the book"
8. (verb) index
adjust through indexation
"The government indexes wages and prices"
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Definition of 'index' 
