noun (n)

• fearful expectation or anticipation(noun.feeling)

  Example:
  The student looked around the examination room with apprehension.
  

  Synonym:
  apprehensiveness, dread
  

  source: wordnet30
• the cognitive condition of someone who understands(noun.cognition)

  Synonym:
  discernment, savvy, understanding
  

  source: wordnet30
• painful expectation(noun.cognition)

  Synonym:
  misgiving
  

  source: wordnet30
• the act of apprehending (especially apprehending a criminal)(noun.act)

  Synonym:
  arrest, catch, collar, pinch, taking into custody
  

  source: wordnet30
• The act of seizing or taking hold of; seizure; as, the hand is an organ of apprehension.(noun)

  source: webster1913