Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
self-sustaining is an adjective meaning "able to provide for your own needs without help from others". It carries one recorded sense.
able to provide for your own needs without help from others
“a self-sufficing economic unit”
Definitions, synonyms and semantic relations for self-sustaining come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.