Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
aleph-null is a noun meaning "the smallest infinite integer". It carries one recorded sense.
the smallest infinite integer
Definitions, synonyms and semantic relations for aleph-null come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.