N. pl. indexes or indices d sz . . Something that serves to guide, point out , or otherwise facilitate reference, especially a. An alphabetized list of names, .Index n., pl. dexes, dices v. n. . in a printed work an alphabetical listing of names, places, and topics along with the numbers of the pages on which they .Statistical composite that measures changes in the economy or in financial markets, often expressed in percentage changes from a base year or from the .Looking for online definition of index in the Medical Dictionary? index explanation free. What is index? Meaning of index medical term. What does index mean?.