follow Dictionary.com

Write a Super Short Story to win an iPod!

indicator

[in-di-key-ter] /ˈɪn dɪˌkeɪ tər/
noun
1.
a person or thing that indicates.
2.
a pointing or directing device, as a pointer on the dial of an instrument to show pressure, temperature, speed, volume, or the like.
3.
an instrument that indicates the condition of a machine or the like.
4.
an instrument for measuring and recording variations of pressure in the cylinder of an engine.
5.
Chemistry.
  1. a substance, as litmus, that indicates the presence or concentration of a certain constituent.
  2. a substance often used in a titration to indicate the point at which the reaction is complete.
6.
Ecology. a plant, animal, or species that indicates, by its presence in a given area, the existence of certain environmental conditions.
Origin
1660-1670
1660-70; < Medieval Latin indicātor, equivalent to Latin indicā(re) to indicate + -tor -tor
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples from the web for indicator
  • That's because the mood in the market is often regarded as a contrarian indicator of future activity.
  • Rankings are essentially one-dimensional, since each indicator is considered independently.
  • Bullfrogs are amazing and they are an indicator of the health of their ecosystems.
  • Unemployment statistics have always been a trailing indicator of current economies.
  • But income is a poor indicator of socioeconomic status.
  • Some studies also suggest that increased inflows of migrants are a leading indicator of a pickup in growth.
  • The earliest indicator yet of autism may be the presence of flawed cells in the placenta, scientists have discovered.
  • Take a close look at the numerals on the second hand indicator.
  • Fuel indicator window reminds you to refill before hiking into the wilderness.
  • The indicator is used in controlling climbs and turns.
British Dictionary definitions for indicator

indicator

/ˈɪndɪˌkeɪtə/
noun
1.
something that provides an indication, esp of trends See economic indicator
2.
a device to attract attention, such as the pointer of a gauge or a warning lamp
3.
an instrument that displays certain operating conditions in a machine, such as a gauge showing temperature, speed, pressure, etc
4.
  1. a device that records or registers something, such as the movements of a lift, or that shows information, such as arrival and departure times of trains
  2. (as modifier): indicator light
5.
Also called blinker. a device for indicating that a motor vehicle is about to turn left or right, esp two pairs of lights that flash when operated or a pair of trafficators
6.
Also called dial gauge. a delicate measuring instrument used to determine small differences in the height of mechanical components. It consists of a spring-loaded plunger that operates a pointer moving over a circular scale
7.
(chem)
  1. a substance used in titrations to indicate the completion of a chemical reaction, usually by a change of colour
  2. a substance, such as litmus, that indicates the presence of an acid or alkali
8.
(ecology) Also called indicator species
  1. a plant or animal species that thrives only under particular environmental conditions and therefore indicates these conditions where it is found
  2. a species of plant or animal whose well-being confirms the well-being of other species in the area
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for indicator
n.

1660s, from Late Latin indicator, agent noun from indicare (see indication). As a finger muscle, from 1690s.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
indicator in Medicine

indicator in·di·ca·tor (ĭn'dĭ-kā'tər)
n.

  1. One that indicates, especially a pointer or an index.

  2. An instrument used to monitor the operation or condition of an engine, an electrical network, or another physical system; a meter or gauge.

  3. The needle, dial, or other registering device on such an instrument.

  4. Any of various substances, such as litmus or phenolphthalein, that indicate the presence, absence, or concentration of another substance or the degree of reaction between substances by means of a characteristic change, especially in color.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
indicator in Science
indicator
  (ĭn'dĭ-kā'tər)   
A chemical compound that changes color and structure when exposed to certain conditions and is therefore useful for chemical tests. Litmus, for example, is an indicator that becomes red in the presence of acids and blue in the presence of bases.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Encyclopedia Article for indicator

chemical indicator

any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution. If acid is slowly added, the solution remains yellow until all the alkali has been neutralized, whereupon the colour suddenly changes to red

Learn more about chemical indicator with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of the Day

Difficulty index for indicator

Some English speakers likely know this word

Word Value for indicator

12
14
Scrabble Words With Friends

Quotes with indicator

Nearby words for indicator