Meaning

• To point out; to discover; to direct to a knowledge of; to show; to make known.

  "The guard blew his whistle to indicate imminent departure."

• To show or manifest by symptoms; to point to as the proper remedies.

  "Great prostration of strength indicates the use of stimulants."

• To signal in a vehicle the desire to turn right or left.

• To investigate the condition or power of, as of steam engine, by means of an indicator.