index
Cross references: 1. fist 1. in.dex \'in-.deks\ \-d*-.se-z\ \in-'dek-si-k*l\ n or in.dex.es or in.di.ces [L indic-, index, fr. indicare to indicate] pl 1: a guide (as a table, file, or series of notches cut in the fore edge of a book) for facilitating reference; esp : a usu. alphabetical list of items (as topics or names) treated in a printed work that gives with each item the page number where it may be found 2: something that serves as a pointer or indicator 3: something that indicates or discloses : TOKEN 4: a list of restricted or prohibited material; specif, cap : a list of books the reading of which is prohibited or restricted for Roman Catholics by the church authorities pl usu indices 5: a number or symbol or expression (as an exponent) associated with anothe r to indicate a mathematical operation or use or position in an arrangement or expansion 6: a character <fist> used to direct particular attention to a note or paragraph 7a: a ratio or other number derived from a series of observations and used as an indicator or measure (as of a condition, property, or phenomenon); specif : INDEX NUMBER 7b: the ratio of one dimension of a thing (as an anatomical structure) to a nother dimension - in.dex.i.cal aj 2. index vt 1a: to provide with an index 1b: to list in an index 2: to serve as an index of : to index something - in.dex.er n
Webster's English Dictionary