SynonymsEdit. (previous) preceding, used-to-be; see also Thesaurus:former; bygone) forepassed, historical; see also Thesaurus:past; inevitable) avoidless. What does foregone mean? foregone is defined by the lexicographers at Oxford Dictionaries as past participle of forego. Foregone definition and meaning, Collins English Dictionary. Foregone conclusion definition: 1. a result that is obvious to everyone even before it happens: 2. a result that is obvious before... Learn more.