Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
vegetational is an adjective meaning "composed of vegetation or plants". It carries one recorded sense.
composed of vegetation or plants
“regions rich in vegetal products”
“vegetational cover”
“the decaying vegetative layer covering a forest floor”
Definitions, synonyms and semantic relations for vegetational come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.