Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
alterable is an adjective meaning "capable of being changed or altered in some characteristic". It carries 2 recorded senses.
capable of being changed or altered in some characteristic
“alterable clothing”
“alterable conditions of employment”
(of the punishment ordered by a court) capable of being changed to one less severe
law
Definitions, synonyms and semantic relations for alterable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.