mid-14c., from Old French adopcion or directly from Late Latin adoptionem (nominative adoptio) "a taking as one's child," shorter form of adoptatio, noun of action from past-participle stem of Latin adoptare "chose for oneself, take by choice, select, adopt," especially "to take into a family, adopt as a child," from ad "to" (see ad-) + optare "choose, wish, desire," from PIE root *op- (2) "to choose" (see option (n.)).
"opposed to abortion," first attested 1976, from pro- + life. Used earlier in a more general sense of "enhancing life." Hostile alternative anti-choice attested 1978 in Ms. magazine (compare pro-choice).
What hypocrisy to call such anti-humanitarian people 'pro-life.' Call them what they are — antichoice. [Ms. magazine, Oct. 8, 1978]
Old English namian "to bestow a particular name upon, call, mention by name; nominate, appoint," from Proto-Germanic *nōmōjanan (source also of Old Saxon namon, Old Frisian nomia "to name, call," Middle Dutch noemen, namen), from the source of name (n.). Related: Named; naming.
Latin, literally "voice," which is the source of vocare "to call" (from PIE root *wekw- "to speak").
mid-15c., opinen, "express an opinion or opinions; to think, suppose," also transitive, "be of the opinion that," from Old French oppiner, opiner (15c.) and directly from Latin opinari "have an opinion, be of opinion, suppose, conjecture, think, judge," which is of unknown origin. It is traditionally considered to be related to optare "to desire, choose" (see option), but de Vaan's sources find the evidence of this weak. Related: Opined; opining.