Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
disciplinal is an adjective meaning "designed to promote discipline". It carries one recorded sense.
designed to promote discipline
“the teacher's action was corrective rather than instructional”
“disciplinal measures”
“the mother was stern and disciplinary”
Definitions, synonyms and semantic relations for disciplinal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.