Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
lineally is an adverb meaning "by an unbroken line of descent". It carries one recorded sense.
by an unbroken line of descent
“she is related lineally to the Royal Family”
Definitions, synonyms and semantic relations for lineally come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.