Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
syntactically is an adverb meaning "with respect to syntax". It carries one recorded sense.
with respect to syntax
“syntactically ill-formed”
Definitions, synonyms and semantic relations for syntactically come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.