How to Say "in existence" in Spanish
The Spanish word for “in existence” is “existente” — B1 level.

Examples
Debemos aprovechar los recursos existentes.
We must make use of the existing resources.
No hay pruebas existentes de vida en ese planeta.
There is no existing evidence of life on that planet.
Las leyes existentes no cubren este nuevo problema.
The current laws do not cover this new problem.
One Ending for Everyone
This word is a 'chameleon' word. Because it ends in -e, it stays exactly the same whether you are describing a masculine noun (el recurso existente) or a feminine noun (la ley existente).
Where it goes in a sentence
In Spanish, this word almost always follows the noun it describes. For example, 'existing problems' becomes 'problemas existentes'.
Don't confuse with 'Actual'
Mistake: “Using 'actualmente' to mean 'existingly'.”
Correction: Use 'existente' for things that exist, and 'actual' for things happening right now. They often overlap, but 'existente' emphasizes that something is real/present.
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