Definition

1. Adjective:
   • Relating to or functioning as an index: Pertaining to something that serves to point to, indicate, or signify something else, often by a direct, contextual, or causal connection.
   • In linguistics and philosophy: Describing a word or expression (like "I," "here," or "now") whose meaning depends entirely on the context of its use (the speaker, time, or place).

Usage Examples

• General use:
  • Smoke is often considered an indexical sign of fire. (Smoke points to the presence of fire.)
  • The historian studied the indexical artifacts to understand the trade routes. (The artifacts served as indicators of the trade routes.)
• Linguistics/Philosophy use:
  • The word "today" is indexical because its referent changes daily. (Its meaning depends on the day it is spoken.)
  • In his analysis, he focused on how indexical expressions like "this" and "that" anchor language to reality. (These words point to things in the immediate context.)

Advanced Usage

• Indexicality (n): The property of being indexical.
  • The philosopher wrote a paper on the indexicality of personal pronouns.
• Non-indexical (adj): Not dependent on context for meaning.
  • The word "water" has a non-indexical, constant meaning across contexts.

Variants and Related Words

• Index (n): A sign, indicator, or list.
  • The economic index showed growth.
• Indexically (adv): In an indexical manner.
  • The term functions indexically, pointing to its object.
• Deixis (n): The linguistic phenomenon of words that require contextual information (a category that includes indexicals).
  • The study of deixis examines words like "you" and "there."

Synonyms

• Indicative: Serving as a sign or indication.
• Denotative: Having the function of denoting or pointing out.
• Context-dependent: (Specifically for the linguistic sense) Meaning is determined by the situation of use.

Related Phrases/Concepts

• Indexical expression: A word or phrase whose reference shifts depending on context (e.g., I, you, here, tomorrow).
  • In "I am here," both "I" and "here" are indexical expressions.
• Indexical sign: In semiotics, a sign where there is a direct, often causal, link between the sign and what it represents (e.g., a footprint is an indexical sign of a foot).
  • A weather vane is an indexical sign of wind direction.

Adjective

1. of or relating to or serving as an index