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