Archaic or rare adjective meaning relating to or capable of adoption; characteristic of an adopted person or process.
From Latin 'adopticius' (relating to adoption), formed from 'adoptio.' This is an older English form, rarely used in modern contexts, preserved mainly in historical and legal texts.
Words like 'adoptious' show the long history of adoption as a legal concept—medieval lawyers needed precise terminology, and some of these old words are so specific they've faded from modern use as simpler alternatives took over.
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