Etymology
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self-sustaining (adj.)

"supporting oneself or itself without extraneous help," 1650s, from self- + present participle of sustain (v.). Related: Self-sustained (1742).

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Definitions of self-sustaining

self-sustaining (adj.)
able to provide for your own needs without help from others;
Synonyms: self-sufficient / self-sufficing
From wordnet.princeton.edu