一斉
  いっせい
  adverbial noun (fukushitekimeishi)
  noun (common) (futsuumeishi)
  simultaneous
  all at once
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  一世
  いっせい
  noun (common) (futsuumeishi)
  generation
  lifetime
  the age
  the day
  noun (common) (futsuumeishi)
  noun, used as a suffix
  [after the name of a king, etc.]
  the First
  noun (common) (futsuumeishi)
  issei
  first-generation Japanese (or Korean, etc.)
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  一声
  いっせい
  ひとこえ
  noun (common) (futsuumeishi)
  voice
  cry
  shout
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