Definition of indicator noun from the Oxford Advanced Learner's Dictionary

Academic

indicator

noun
ˈɪndɪkeɪtə(r)
 
; ˈɪndɪkeɪtər
 
 
1 a sign that shows you what something is like or how a situation is changingThe economic indicators are better than expected.These atmospheric waves are a reliable indicator of weather changes.2 a device on a machine that shows speed, pressure, etca depth indicator3 (British English) (North American English turn signal) (also informal blinker North American English, British English) a light on a vehicle that flashes to show that the vehicle is going to turn left or rightHer right-hand indicator was flashing.
Usage noteUsage note: signindication symptom symbol indicator signalThese are all words for an event, action or fact that shows that something exists, is happening or may happen in the future.sign an event, action or fact that shows that something exists, is happening or may happen in the future:Headaches may be a sign of stress.indication (rather formal) a remark or sign that shows that something is happening or what somebody is thinking or feeling:They gave no indication as to how the work should be done.sign or indication?An indication often comes in the form of something that somebody says; a sign is usually something that happens or something that somebody does.symptom a change in your body or mind that shows that you are not healthy; a sign that something exists, especially something bad:Symptoms include a sore throat. The rise in inflation was just one symptom of the poor state of the economy.symbol a person, object or event that represents a more general quality or situation:The dove is a universal symbol of peace.indicator (rather formal) a sign that shows you what something is like or how a situation is changing:the economic indicatorssignal an event, action or fact that shows that something exists, is happening or may happen in the future:Chest pains can be a warning signal of heart problems.sign or signal?Signal is often used to talk about an event, action or fact that suggests to somebody that they should do something. Sign is not usually used in this way:Reducing prison sentences would send the wrong signs to criminals.a(n) sign/indication/symptom/symbol/indicator/signal of somethinga(n) sign/indication/symptom/indicator/signal that…a clear sign/indication/symptom/symbol/indicator/signalan obvious sign/indication/symptom/symbol/indicatoran early sign/indication/symptom/indicator/signalan outward sign/indication/symbolto give a(n) sign/indication/signal