The act of transferring ownership of property to another person, or the state of being estranged from something one formerly possessed.
From 'abalienate' plus the suffix '-tion,' which converts verbs to nouns indicating the action or result. This abstract noun form emphasizes the completed transfer or separation.
Medieval lawyers loved this word because it's the ultimate in precision—it doesn't just mean you lost something, it means you *officially transferred it away*, which is completely different legally.
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