year zero

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English

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Noun

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year zero (uncountable)

  1. (literally) a non-existing (but often assumed) year in between 1 BCE/BC and 1 CE/AD
    The new millenium only began in 2001 because there is no year zero!
  2. (loosely) the beginning of the Common Era/Christian Era
    What was life in Rome like around the year zero?