Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
penitential is an adjective meaning "showing or constituting penance". It carries one recorded sense.
showing or constituting penance
“penitential tears”
“wrote a penitential letter apologizing for her hasty words”
Definitions, synonyms and semantic relations for penitential come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.