I. (ˌ)in-ˈdek-si-kəl adjective
Date: circa 1828
1. : of or relating to an index
2.
a. : varying in reference with the individual speaker
the indexical words I, here, now
b. : associated with or identifying an individual speaker
indexical features of speech
II. noun
Date: 1971
: an indexical word, sign, or feature