Definition of "aliveness"

... she's such a perplexing mixture of old New England and modernity, of a fatalism, and an aliveness that fairly vibrates.

1917, Winston Churchill, The Dwelling-Place of Light

[…] her eyes betrayed a complicated totality of paradoxical alivenesses.

1920, Jack London, chapter 18, in Hearts of Three‎, New York: Macmillan, page 231

Sea-water wet their feet, wind tossed their hair, excitement quivered in every fibre of their aliveness.

1944, Emily Carr, “Beacon Hill”, in The House of All Sorts