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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 ?
O my soul, to thy domain gave I all wisdom to drink, all new wines, and also all immemorially old strong wines of wisdom.
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.
But it turns out that we can only transcend the inequalities of the past if we institute precisely the form of social order - a despotism - which Western civilization has immemorially found incompatible with its free and independent customs.
Conversely, a culture that is cursed by intellectual lassitude, or that feels threatened by innovation, will find itself moving around the treadmill of immemorially posited norms, repeating itself from generation to generation, left by the wayside in the global dialogue of cultures.
75) The Court looks especially skeptically at TPM regulations of the "quintessential public forum," (76) places that "have immemorially been held in trust for the use of the public" for the purposes of expression.
That antient [sic] collection of unwritten maxims and customs, which is called the common law, however compounded or from whatever fountains derived, had subsisted immemorially in this kingdom; and, though somewhat altered and impaired by the violence of the times, had in great measure weathered the rude shock of the Norman conquest.
254) The Court only began extending First Amendment protection to public property in the first half of the twentieth century, alongside its emerging recognition that certain public spaces such as parks, streets, and sidewalks "have immemorially been held in trust for use of the public and, time out of mind, have been used for purposes of assembly, communicating thoughts between citizens, and discussion of public questions.
496, 515 (1939) ("Wherever the title of streets and parks may rest, they have immemorially been held in trust for the use of the public.
Florida, (71) where Hugo Black threw out the Due Process Clause with an eye toward the European conflict, he wrote: "Tyrannical governments had immemorially utilized dictatorial criminal procedure and punishment to make scapegoats of the weak, or of helpless religious, or confessions of several black youths interrogated over the course of several days with little rest and no access to assistance.
52, 64 (1941) ("One of the most important and delicate of all international relationships, recognized immemorially as a responsibility of government, has to do with the protection of the just rights of a country's own nationals when those nationals are in another country.
To be sure, this process will not just have a corrosive impact on society; it will immobilize it, and leave it repeating itself helplessly from generation to generation, running around the treadmill of immemorially posited norms.