Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
punctiliously is an adverb meaning "in a punctilious manner". It carries one recorded sense.
in a punctilious manner
“he launched into a long history of the birth of communism, giving credit punctiliously to the work of Marx and Engels”
Definitions, synonyms and semantic relations for punctiliously come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.