기억이나 기록조차 없을 정도로 아주 먼 옛날부터 존재해 온.
Originating in the distant past and existing beyond the reach of memory or record.
예문:
"The indigenous tribes have inhabited these lands since time immemorial."
"The village elders still practice immemorial rituals passed down through generations."
"The mountains stood as silent witnesses to the immemorial changes of the earth."