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