Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
bimillenial is an adjective meaning "of or relating to a bimillennium". It carries one recorded sense.
of or relating to a bimillennium
Definitions, synonyms and semantic relations for bimillenial come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.