noun
a thing, especially a trend or fact, that indicates the state or level of something
adjective
indicative or suggestive of something
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The economic growth rate is often used as an indicator of a country's overall financial health.
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His constant yawning during the meeting was a clear indicator that he was bored.
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Her eye roll was a major indicator that she was not impressed with his joke.
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The dark clouds gathering in the sky were an indicator of the impending storm.