## Meanings
1. A sign or measurement that shows what a situation is like.
2. A device, dial, or light that shows the condition of a system.
3. A substance that changes color to show the presence of a chemical.

## Examples
- Unemployment is an important indicator of economic health.
- A red indicator on the dashboard warns you when fuel is low.
- The indicator turned pink, showing the solution was alkaline.

## Derived Forms
- anagrind
- bioindicator
- contraindicator
- paleoindicator
- phytoindicator
- subindicator

## Related Forms
- index
- indicate
- indication
- indicative

## Roots and Affixes
- Root: *deyḱ-
- Root: indicātor
- Root: indicō

## Etymology
From Late Latin indicātor (“one who points out”), from Latin indicō (“point out”). By surface analysis, indicate + -or; see indicate.

## AI Etymology
Indicator comes from Late Latin indicātor (“one who points out”), from Latin indicō (“point out”). By surface analysis, indicate + -or; see indicate. The historical chain includes *deyḱ- (Proto-Indo-European), indicātor (Late Latin), and indicō (Latin). The surrounding word family includes derived forms such as anagrind, bioindicator, contraindicator, and paleoindicator and related forms such as index, indicate, and indication. In present use it covers a sign or measurement that shows what a situation is like, a device, dial, or light that shows the condition of a system, and a substance that changes color to show the presence of a chemical.

## Topics
- Describing Qualities
- Materials & Substances
- Word Formation & Derivatives

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