existence

n. living, state of existing, state of being; life

The study of existence is a branch of philosophy known as ontology.Many questions arise concerning existence. Is what we experience and observe all there is to existence? Do abstract ideas, such as virtue, exist? Is existence orderly and knowable or chaotic and unknowable? Does there exist an external reality that is completely ontologically independent of our conceptual schemes, linguistic practices, and beliefs?
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n. existence, life, being, lifetime

(n.)
The state of existing or being; actual possession of being; continuance in being; as, the existence of body and of soul in union; the separate existence of the soul; immortal existence.
  

(n.)
That which exists; a being; a creature; an entity; as, living existences.
  

(n.)
Continued or repeated manifestation; occurrence, as of events of any kind; as, the existence of a calamity or of a state of war.
  

Existence [from Latin exsisto standing forth, emerging] Although often used interchangeably with being, in theosophy being refers to abstract continuity in spirit, while existence means the phenomenal manifestation of an entity in the phenomenal worlds. Therefore being is the noumenon and existence is the phenomenon. Hence one can speak of the causes of existence (nidanas), or of all existences being dissolved. The Absolute, a cosmic hierarch, is defined with equal appropriateness as absolute existence and as non-existence. Non-existence is described as absolute being, existence, and consciousness (SD 1:39). Fichte makes a proper distinction between being (Seyn) and existence (Daseyn), the former being the noumenal One, and the latter the phenomenal manifold through which the One is known.