What is "indexical"

Indexical \In*dex"ic*al\, a. Of, pertaining to, or like, an index; having the form of an index.

a. 1 Of, pertaining to, or like, an index; having the form of an index. 2 (context linguistics philosophy English) Having the character of pointing to, or indicate, a particular state of affairs n. (context linguistics philosophy English) An #Adjective statement

adj. of or relating to or serving as an index