Etymology
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exist (v.)

"to have actual being of any kind, actually be at a certain moment or throughout a certain period of time," c. 1600, from French exister (17c.), from Latin existere/exsistere "to step out, stand forth, emerge, appear; exist, be" (see existence). "The late appearance of the word is remarkable" [OED]. Middle English often used ibēn, ibeon (based on be) for "to exist."  Related: Existed; existing.

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Definitions of exist

exist (v.)
have an existence, be extant;
Synonyms: be
exist (v.)
support oneself;
he could barely exist on such a low wage
Synonyms: survive / live / subsist
From wordnet.princeton.edu