noun

  1. generation, lifetime.
  2. the age, the day.

noun, noun used as a suffix

  1. the first (e.g. Elizabeth I).

noun

  1. issei, first-generation Japanese (or Korean, etc.).

Variations

Pronunciation Kanji Kana Is Common
一世 いっせい

Contained Kanji Breakdown

one, one radical (no.1)
イチ いっ ひと- (1st, N5)
generation, world, society
セ よ セイ (3rd, N4)
twenty
にじゅう ジュウ ニュウ (Kentei Pre-1)
fishhook radical(乙) variant