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Related to existence: Existence of aliens
1. The fact or state of existing; being.
2. The fact or state of continued being; life: our brief existence on Earth.
a. All that exists: sang the beauty of all existence.
b. A thing that exists; an entity.
4. A mode or manner of existing: scratched out a meager existence.
5. Specific presence; occurrence: The Geiger counter indicated the existence of radioactivity.