BYGONE Meaning of BYGONE in English by ‧ gone /ˈbaɪɡɒn $ -ɡɒːn/ BrE AmE adjective bygone age/era/days etc a period of time in the past:The buildings reflect the elegance of a bygone era. Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012