Self-existent is a rather uncommon term, but it essentially means existing solely by its own inherent qualities or without requiring any external factors to sustain it. There are several synonyms for this word, each of which emphasizes slightly different aspects of self-existence. For example, the term self-sustaining emphasizes the capacity for independent survival and growth, whereas self-perpetuating suggests ongoing reproduction or continual renewal. Other synonyms include self-reliant, autonomous, and self-contained. Ultimately, all of these words attest to the inherent power and strength of something that can exist and thrive on its own, without relying on anything else for support.