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Reaching beyond the limits of memory, tradition, or recorded history.

[Medieval Latin immemoriālis : Latin in-, not; see in-1 + Latin memoriālis, memorial; see memorial.]

im′me·mo′ri·al·ly adv.
References in classic literature ?
But the captain, for some unknown constitutional reason, had refrained from mentioning all this, and not till forced to it by Ahab's iciness did he allude to his one yet missing boy; a little lad, but twelve years old, whose father with the earnest but unmisgiving hardihood of a Nantucketer's paternal love, had thus early sought to initiate him in the perils and wonders of a vocation almost immemorially the destiny of all his race.
The labourers--or "work-folk", as they used to call themselves immemorially till the other word was introduced from without--who wish to remain no longer in old places are removing to the new farms.
O my soul, to thy domain gave I all wisdom to drink, all new wines, and also all immemorially old strong wines of wisdom.
How have the Jews, immemorially associated with suffering and high moral purpose, become identified with a nation-state loathed around the world for its oppressiveness toward a subjugated indigenous people?
Only by understanding the nature of traditional architecture, honed immemorially by humankind's relationship to nature, can we begin to make sustainable buildings.
Committee for Industrial Organization, (134) Justice Roberts noted that "wherever the title of streets and parks may rest, they have immemorially been held in trust for the use of the public and time out of mind, have been used for purposes of assembly, communicating thoughts between citizens, and discussing public questions.
The serpent has immemorially served as a symbol of the eternal renewal of life in many societies through its annual renew al of its skin.