Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
maximally is an adverb meaning "to a maximal degree". It carries one recorded sense.
to a maximal degree
“the cells maximally responsive to lines in this orientation will fire”
Definitions, synonyms and semantic relations for maximally come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .