word forming element indicating "oneself," also "automatic," from Old English use of self (pron.) in compounds, such as selfbana "suicide," selflice "self-love, pride, vanity, egotism," selfwill "free will." Middle English had self-witte "one's own knowledge and intelligence" (early 15c.).
OED counts 13 such compounds in Old English. Middle English Compendium lists four, counting the self-will group as a whole. It re-emerges as a living word-forming element mid-16c., "probably to a great extent by imitation or reminiscence of Greek compounds in (auto-)," and formed a great many words in the pamphlet disputes of the 17c.
1610s, "action of relinquishing to another," from French abandonnement (Old French abandonement), from abandonner "to give up" (see abandon (v.)). Meaning "a deserting, forsaking" (of one's family, principles, etc.) is by 1788; from 1839 as "condition of being forsaken." In law, the relinquishing of a title, privilege, or claim. In music, Italian abbandonatamente is the instruction to play so as to make the time subordinate to the feeling.
<a href="https://www.etymonline.com/word/self-abandonment">Etymology of self-abandonment by etymonline</a>
Harper, D. (n.d.). Etymology of self-abandonment. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/self-abandonment