Noun, Suru verb, Intransitive verb, Noun which may take the genitive case particle 'no'
1. existence; being; presence
Wikipedia definition
2. ExistenceExistence has been variously defined by sources. In common usage, it is the world we are aware of through our senses, and that persists independently without them. Others define it as everything that is. Ontology is the philosophical study of the nature of being, existence or reality in general, as well as of the basic categories of being and their relations.
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