ego (n.) by 1707, in metaphysics, “the self; that which feels, acts, or thinks,” from Latin ego “I” (cognate with Old English ic; see I); its use is implied in egoity. They that have pleaded against Propriety, and would have all things common in this World, have forgotten that there is a Propriety, in our present Egoity, and Natural Constitution, which rendereth some accidental Propriety necessary to us (etc.) [“The Practical Works of […]