noun (n)

• the unit of frequency; one hertz has a periodic interval of one second(noun.time)

  Synonym:
  cps, cycle, cycle per second, cycles/second, hz
  

  source: wordnet30
• German physicist who was the first to produce electromagnetic waves artificially (1857-1894)(noun.person)

  Synonym:
  heinrich hertz, heinrich rudolph hertz
  

  source: wordnet30
• German physicist who with James Franck proved the existence of the stationary energy states postulated by Bohr (1887-1975)(noun.person)

  Synonym:
  gustav hertz, gustav ludwig hertz
  

  source: wordnet30