The meaning of EXIST is to have real being whether material or spiritual. How to use exist in a sentence.

EXISTING definition: already or previously in place, before being replaced, altered, or added to. See examples of existing used in a sentence.

(Definition of existing from the Cambridge Academic Content Dictionary © Cambridge University Press)

Existing is used to describe something which is now present, available, or in operation, especially when you are contrasting it with something which is planned for the future.

Something that's real can be said to exist, or to be existing. The existing laws in your state are the ones that are actually on the books, and your existing friends are the ones you really have, …

existing [ɪgˈzɪstɪŋ] ADJ [customers, products, facilities] → existente; [law, arrangements, system] → actual, existente under existing circumstances → en las circunstancias actuales or existentes

being in use or in operation at the time of writing or speaking: under the existing economic conditions. be: "I'm real— I exist,'' he said. live:[not: be + ~-ing] Human beings could not exist …