noun (n)

• the process of taking in and expelling air during breathing(noun.act)

  Example:
  He took a deep breath and dived into the pool.
  He was fighting to his last breath.
  

  source: wordnet30
• the air that is inhaled and exhaled in respiration(noun.substance)

  Example:
  His sour breath offended her.
  

  source: wordnet30
• a short respite(noun.time)

  Synonym:
  breather, breathing place, breathing space, breathing spell, breathing time
  

  source: wordnet30
• an indirect suggestion(noun.communication)

  Example:
  Not a breath of scandal ever touched her.
  

  Synonym:
  hint, intimation
  

  source: wordnet30
• a slight movement of the air(noun.phenomenon)

  Example:
  There wasn't a breath of air in the room.
  

  source: wordnet30
• The air inhaled and exhaled in respiration; air which, in the process of respiration, has parted with oxygen and has received carbonic acid, aqueous vapor, warmth, etc.(noun)

  source: webster1913