Similar words: sustaining, staining, self-supporting, sustain, sustained, sustainer, sustainment, sustainable. Meaning: adj. able to provide for your own needs without help from others.
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31. In short, the Sun's large-scale magnetic field is taken to be self-sustaining, so that the solar-activity cycle it drives would be maintained with little overall change for perhaps billions of years.
More similar words: sustaining, staining, self-supporting, sustain, sustained, sustainer, sustainment, sustainable, self-sufficient, unsustainable, self-sufficiency, sustainability, maintaining, obtaining, retaining, entertaining, self-determining, entertainingly, self-starter, self-seeking, self-serving, self-contained, self-sacrificing, selfsame, raining, gaining, self-study, draining, training, self-styled.