1.  existence(n = noun.state) being, beingness - the state or fact of existing; "a point of view gradually coming into being"; "laws in existence for centuries"
is a kind of state
has particulars: actuality, eternity, timeless existence, timelessness, preexistence, coexistence, subsistence, presence, life, aliveness, animation, life, living, life, transcendence, transcendency, possibility, possibleness
Antonym: nonexistence
Derived forms verb exist₁, adjective existent₃, adjective existent₁, adjective existent₂, adjective existential₃

2.  existence(n = noun.object) cosmos, creation, macrocosm, universe, world - everything that exists anywhere; "they study the evolution of the universe"; "the biggest tree in existence"
is a kind of natural object
has parts: celestial body, heavenly body, estraterrestrial body, extraterrestrial object
has particulars: closed universe, natural order, nature

1.  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. [1913 Webster]
"The main object of our existence." [1913 Webster]

2.  Continued or repeated manifestation; occurrence, as of events of any kind; as, the existence of a calamity or of a state of war. [1913 Webster]
"The existence therefore, of a phenomenon, is but another word for its being perceived, or for the inferred possibility of perceiving it." [1913 Webster]

3.  That which exists; a being; a creature; an entity; as, living existences. [1913 Webster]

existence, n.
1 the fact or condition of being or existing.
2 the manner of one's existing or living, esp. under adverse conditions (a wretched existence).
3 an existing thing.
4 all that exists.

Etymology:
ME f. OF existence or LL existentia f. L exsistere (as EX-(1), stare stand)

N  existence, being, entity, ens, esse, subsistence, reality, actuality, positiveness, fact, matter of fact, sober reality, truth, actual existence, presence, coexistence, stubborn fact, hard fact, not a dream, no joke, center of life, essence, inmost nature, inner reality, vital principle, ontology, existing, existent, under the sun, in existence, extant, afloat, afoot, on foot, current, prevalent, undestroyed, real, actual, positive, absolute, true, substantial, substantive, self-existing, self-existent, essential, well-founded, well-grounded, unideal, unimagined, not potential, authentic, actually, in fact, in point of fact, in reality, indeed, de facto, ipso facto, ens rationis, ergo sum cogito, thinkest thou existence doth depend on time?.

N  life, vitality, viability, animation, vital spark, vital flame, soul, spirit, respiration, wind, breath of life, breath of one's nostrils, oxygen, air, respirator, artificial respirator, heart and lung machine, iron lung, medical devices, lifeblood, Archeus, existence, vivification, vital force, vitalization, revivification, Prometheus, life to come, physiology, biology, animal ecology, nourishment, staff of life, genetics, heredity, inheritance, evolution, natural selection, reproduction (production), microbe, aerobe, anaerobe, facultative anaerobe, obligate aerobe, obligate anaerobe, halophile, methanogen, archaebacteria, microaerophile, animal, vegetable, artificial life, robot, robotics, artificial intelligence, breathing, breathing rate, heartbeat, pulse, temperature, preservation of life, healing (medicine), living, alive, in life, in the flesh, in the land of the living, on this side of the grave, above ground, breathing, quick, animated, animative, lively, all alive and kicking, tenacious of life, full of life, yeasty, vital, vitalic, vivifying, vivified viable, zoetic, Promethean, vivendi causa, atqui vivere militare est, non est vivere sed valere vita.

timeless existence