immemorial
adjective /ˌɪməˈmɔːriəl/
/ˌɪməˈmɔːriəl/
(formal or literary)- that has existed for longer than people can remember
古老的；远古的；无法追忆的 - an immemorial tradition
古老的传统 - My family has lived in this area from time immemorial (= for a very long time).
我的家族在这个地区已经生活了不知有多少年了。
词源early 17th cent.: from medieval Latin immemorialis, from in- ‘not’ + memorialis ‘relating to the memory’. - an immemorial tradition