noun (n)

• the process of oscillating between states(noun.process)

  source: wordnet30
• (physics) a regular periodic variation in value about a mean(noun.event)

  Synonym:
  vibration
  

  source: wordnet30
• a single complete execution of a periodically repeated phenomenon(noun.event)

  Synonym:
  cycle
  

  source: wordnet30
• The act of oscillating; a swinging or moving backward and forward, like a pendulum; vibration.(noun)

  source: webster1913