Webster's Revised Unabridged Dictionary · 1913

Ens

Ens (enz) , noun

[Latin, ens, entis, a thing. See Entity.]

1.
(Metaphysics) Entity, being, or existence; an actually existing being; also, God, as the Being of Beings.
2.
(Chemistry) Something supposed to condense within itself all the virtues and qualities of a substance from which it is extracted; essence. [Obsolete]