Definition of Indicator

1. Noun. A number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time.

2. Noun. A signal for attracting attention.
Generic synonyms: Sign, Signal, Signaling
Specialized synonyms: Point Of Reference, Reference, Reference Point
Derivative terms: Indicate

3. Noun. A device for showing the operating condition of some system.

4. Noun. (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction.

Definition of Indicator

1. n. One who, or that which, shows or points out; as, a fare indicator in a street car.

Definition of Indicator

1. Noun. A pointer or index that indicates something. ¹

2. Noun. A meter or gauge. ¹

3. Noun. The needle or dial on such a meter. ¹

4. Noun. (chemistry) Any of many substances, such as litmus, used to indicate the concentration of a substance, or the degree of a reaction. ¹

5. Noun. (ecology) A plant or animal whose presence is indicative of some specific environment. ¹

6. Noun. (economics) A measure, such as unemployment rate, which can be used to predict economic trends. ¹

7. Noun. (U.K.) A trafficator. ¹

¹ Source:

Definition of Indicator

1. [n -S]

Medical Definition of Indicator

1. An event, entity or condition that typically characterises a prescribed environment or situation, indicators determine or aid in determining whether or not certain stated circumstances exist or criteria are satisfied. (09 Oct 1997)

Lexicographical Neighbors of Indicator

indicative mood
indicative moods
indicator (current term)
indicator dilution method
indicator dilution techniques
indicator lamp
indicator organisms
indicator plant
indicator system
indicator yellow
indicators and reagents

Literary usage of Indicator

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Dictionary of Applied Chemistry by Thomas Edward Thorpe (1912)
"those of litmus, the indicator is more closely allied to methyl orange. It ¡к only «lightly affected by carbon dioxide, although direct t it ration of ..."

2. Older Americans 2000: Key Indicators of Well-Beingby Katherine K Wallman by Katherine K Wallman (2000)
"... indicator 1: Number of Older Americans 2 indicator 2: Racial and Ethnic Composition 4 indicator 3: Marital Status 5 indicator 4: Educational Attainment ..."

3. Report of the Annual Meeting (1864)
"Richards's indicator for Steam Engines. By CT PORTEE. In respect to the ability of these indicators to give diagrams which shall be perfectly accurate, ..."

4. The Journal of Infectious Diseases by Infectious Diseases Society of America, John Rockefeller McCormick Memorial Fund, John McCormick Institute for Infectious Diseases (1914)
"I have found it eminently satisfactory as an indicator of the production ... The indicator is prepared as follows: Acid fuchsin (fuchsin S. Grubler) 0.5 gm. ..."

5. Dyke's Automobile and Gasoline Engine Encyclopedia by Andrew Lee Dyke (1916)
"1—This illustration is intended to explain how to p.ace an ammeter between "battery," "cutout," and "indicator" to test the accuracy of each. ..."

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