noun (n)

• an interruption in the intensity or amount of something(noun.event)

  Synonym:
  abatement, reprieve, respite, suspension
  

  source: wordnet30
• a missing piece (as a gap in a manuscript)(noun.communication)

  source: wordnet30
• a natural opening or perforation through a bone or a membranous structure(noun.body)

  Synonym:
  foramen
  

  source: wordnet30
• An opening; an aperture; a gap; a chasm; esp., a defect in a manuscript, where some part is lost or effaced; a space where something is wanting; a break.(noun)

  source: webster1913