existence-n; 4 Senses

Sense Number 1: a state of being, not hypothetical

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

Examples:
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.

Mappings:
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)

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

Mappings:
WordNet 3.0 Sense Numbers: 2

Sense Number 3: a lifestyle, way of life

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

Examples:
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.

Mappings:
WordNet 0.0 Sense Numbers: 1b

Sense Number 4: a specific situation or occurrence

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

Examples:
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.

Mappings:
WordNet 0.0 Sense Numbers: 1