What is the meaning of apprehension?

noun

• Fearful expectation or anticipation.
  • usage: "the student looked around the examination room with apprehension"
  • synonyms: apprehensiveness, dread
• The cognitive condition of someone who understands.
  • usage: "he has virtually no understanding of social cause and effect"
  • synonyms: understanding, discernment, savvy
• Painful expectation.
  • synonyms: misgiving
• The act of apprehending (especially apprehending a criminal. )
  • usage: "the policeman on the beat got credit for the collar"
  • synonyms: arrest, catch, collar, pinch, taking into custody