noun (n)

• the quality of being significant(noun.attribute)

  Example:
  Do not underestimate the significance of nuclear power.
  

  Antonym:
  insignificance
  

  source: wordnet30
• a meaning that is not expressly stated but can be inferred(noun.cognition)

  Example:
  The significance of his remark became clear only later.
  

  Synonym:
  implication, import
  

  source: wordnet30
• the message that is intended or expressed or signified(noun.communication)

  Example:
  The significance of a red traffic light.
  

  Synonym:
  import, meaning, signification
  

  source: wordnet30
• The quality or state of being significant.(noun)

  source: webster1913