OK, any suggestions for a definition?
Okay, but I don't want to get ahead of ourselves. These have been just for example.
The 'soul' which is an unfortunate translation of apparent necessity, is the life, life experiences of any breathing creature. It's the blood.
“There is no dichotomy [division] of body and soul in the OT. The Israelite saw things concretely, in their totality, and thus he considered men as persons and not as composites. The term nepeš, though translated by our word soul, never means soul as distinct from the body or the individual person. . . . The term [psy·khe′] is the NT word corresponding with nepeš. It can mean the principle of life, life itself, or the living being.” - New Catholic Encyclopedia (1967), Vol. XIII, pp. 449, 450.
“The Hebrew term for ‘soul’ was used by Moses . . . , signifying an ‘animated being’ and applicable equally to nonhuman beings. . . . New Testament usage of psychē (‘soul’) was comparable to nefesh.” - The New Encyclopædia Britannica (1976), Macropædia, Vol. 15, p. 152.
“The belief that the soul continues its existence after the dissolution of the body is a matter of philosophical or theological speculation rather than of simple faith, and is accordingly nowhere expressly taught in Holy Scripture.” - The Jewish Encyclopedia (1910), Vol. VI, p. 564.
“The Christian concept of a spiritual soul created by God and infused into the body at conception to make man a living whole is the fruit of a long development in Christian philosophy. Only with Origen [died c. 254 C.E.] in the East and St. Augustine [died 430 C.E.] in the West was the soul established as a spiritual substance and a philosophical concept formed of its nature. . . . His [Augustine’s] doctrine . . . owed much (including some shortcomings) to Neoplatonism.”—New Catholic Encyclopedia (1967), Vol. XIII, pp. 452, 454.
“The concept of immortality is a product of Greek thinking, whereas the hope of a resurrection belongs to Jewish thought. . . . Following Alexander’s conquests Judaism gradually absorbed Greek concepts.” - Dictionnaire Encyclopédique de la Bible (Valence, France; 1935), edited by Alexandre Westphal, Vol. 2, p. 557.
“Immortality of the soul is a Greek notion formed in ancient mystery cults and elaborated by the philosopher Plato.” - Presbyterian Life, May 1, 1970, p. 35.
“Do we believe that there is such a thing as death? . . . Is it not the separation of soul and body? And to be dead is the completion of this; when the soul exists in herself, and is released from the body and the body is released from the soul, what is this but death? . . . And does the soul admit of death? No. Then the soul is immortal? Yes.” - Plato’s “Phaedo,” Secs. 64, 105, as published in Great Books of the Western World (1952), edited by R. M. Hutchins, Vol. 7, pp. 223, 245, 246.
“The problem of immortality, we have seen, engaged the serious attention of the Babylonian theologians. . . . Neither the people nor the leaders of religious thought ever faced the possibility of the total annihilation of what once was called into existence. Death was a passage to another kind of life.”—The Religion of Babylonia and Assyria (Boston, 1898), M. Jastrow, Jr., p. 556.