Ｘ世代えっくすせだい

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Meanings

1

noun

Generation X; Gen X

Refers to the generation born roughly between the mid-1960s and early 1980s, following the baby boomers.

generation, world, society

代substitute, change, convert

ベビーブーマー
Baby boomers are the generation born before Generation X, typically in the post-WWII baby boom.
ミレニアル世せ代だい
Millennials (Generation Y) are the generation following Generation X, born roughly from the early 1980s to mid-1990s.

Borrowed from English 'Generation X', with the 'X' retained in its Latin alphabet form and combined with 世代 (sedai, 'generation').