existence-n; 4 Senses

Sense Number 1: a state of being, not hypothetical

Commentary: EXISTENCE[+state][+being][-hypothetical]

It is the oldest living redwood tree in existence.
The psychic told John he had been a Scottish King in a previous existence.
The very existence of their company is at stake.
The passenger pigeon was hunted out of existence in the last century.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: everything that is, not hypothetical things

Commentary: EXISTENCE[+entity][+everything][+real]
NOTE: refers to all -things-, not a -state- (see Sense 1)

He thought about existence, why there is something, rather than nothing.
All existence will succumb to entropy, according to the 2nd Law of Thermodynamics.

WordNet 3.0 Sense Numbers: 2

Sense Number 3: a lifestyle, way of life

Commentary: EXISTENCE[+state][+social][+lifestyle]

They found a rural existence a big change after life in the city.
He scratched out a meager existence as a cashier in a fast food restaurant.
The film depicted the wretched existence of the refugees in the camps.

WordNet 0.0 Sense Numbers: 1b

Sense Number 4: a specific situation or occurrence

Commentary: EXISTENCE[+state][+circumstance][+specific]

The existence of a state of war for two years has had an effect on the economy.
He denied the existence of any rivalry among his staff members.
The doctor detected the existence of a small tumor on the patient's spine.

WordNet 0.0 Sense Numbers: 1