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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
High Representative, Excellencies, 'What if a shooting happens here?' This is now the main question of faith-based communities in the wake of the horrifying attacks on worshippers and religious gathering places immemorially regarded by all religions as sanctuaries.
The Supreme Court has built the public forum doctrine on the premise that parks, streets, and sidewalks have been open for speech "immemorially ...
You see, without that freedom, there is no intellectual inquisitiveness, and without that, there is no opening for people to escape the treadmill of immemorially posited norms, no way to thrust themselves beyond their fixed meaning.
Africa is the quintessential locus of the primitive: it tells a tale of "the eternal beginning" and gives "the most intense sentiment of returning to the land of my youth"; it is "the immemorially known." For Euro-Americans, then, to study the primitive brings us always back to ourselves, which we reveal in the act of defining the Other.
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.
M., <<Reading Immemorially: The Quaestio and the Paragraph in the Summa Theologiae>>, American Catholic Philosophical Quarterly 4 (2004) 531-557.
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.
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." (255)