Noun

The state of being, existing, or occurring; beinghood.

*

, title=(The Celebrity), chapter=1 , passage=However, with the dainty volume my quondam friend sprang into fame. At the same time he cast off the chrysalis' of a commonplace ' existence .}}

* {{quote-magazine, year=2012, month=March-April, author=(Jeremy Bernstein)

, volume=100, issue=2, page=146, magazine=(American Scientist) , title= A Palette of Particles , passage=The physics of elementary particles in the 20th century was distinguished by the observation of particles whose existence had been predicted by theorists sometimes decades earlier.}}

Empirical reality; the substance of the physical universe. (Dictionary of Philosophy; 1968)

Noun

(wikipedia lifespan) (en noun)

The length of time for which an organism lives.

*{{quote-magazine, year=2012, month=March-April

, author=Anna Lena Phillips , title=Sneaky Silk Moths , volume=100, issue=2, page=172 , magazine=(American Scientist) citation , passage=Last spring, the periodical cicadas emerged across eastern North America. Their vast numbers and short above-ground life spans inspired awe and irritation in humans—and made for good meals for birds and small mammals.}}

Some clams have lifespans far longer than those of human beings.

(by extension)  The length of time for which something exists or is current or valid.

* 2002 , Luis M Camarinha-Matos, Collaborative business ecosystems and virtual enterprises

The virtual enterprise forum developed several "classical" management functions for which resources were available throughout its lifespan .