noun (n)

• something that serves to indicate or suggest(noun.communication)

  Example:
  An indication of foul play.
  Indications of strain.
  

  Synonym:
  indicant
  

  source: wordnet30
• the act of indicating or pointing out by name(noun.communication)

  Synonym:
  denotation
  

  source: wordnet30
• (medicine) a reason to prescribe a drug or perform a procedure(noun.communication)

  Example:
  The presence of bacterial infection was an indication for the use of antibiotics.
  

  Antonym:
  contraindication
  

  source: wordnet30
• something (as a course of action) that is indicated as expedient or necessary(noun.communication)

  Example:
  There were indications that it was time to leave.
  

  source: wordnet30
• a datum about some physical state that is presented to a user by a meter or similar instrument(noun.cognition)

  Example:
  The barometer gave clear indications of an approaching storm.
  

  Synonym:
  meter reading, reading
  

  source: wordnet30
• Act of pointing out or indicating.(noun)

  source: webster1913