Meaning

2 senses
  1. (literally, uncountable)A non-existing (but often assumed) year in between 1 BCE/BC and 1 CE/AD

    The new millennium only began in 2001 because there is no year zero!

  2. (broadly, uncountable)The beginning of the Common Era/Christian Era

    What was life in Rome like around the year zero?

See also

neighbours in the dictionary
year zero — meaning, examples, forms, synonyms | Krumeto