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