from/since time immemorial
from time immemorial
From a time long before one would be able to remember; from the distant past. Our family line has presided over this land from time immemorial. Giant sea turtles have been coming to this spot to mate from time immemorial.
since time immemorial
since a very long time ago. (Literally, since time before recorded history.) My hometown has had a big parade on the Fourth of July since time immemorial. since time immemorial, the trees have blossomed each spring.
since time immemorialor
from time immemorialLITERARY
If you say that something has been happening since time immemorial or from time immemorial, you mean that it has been happening for many centuries. Thailand's central position in Southeast Asia has had a major effect on the art of the area since time immemorial. From time immemorial, we have danced to celebrate the sacred forces of Nature.