immemorial

[im-uh-mawr-ee-uhl, -mohr-]
adjective
extending back beyond memory, record, or knowledge: from time immemorial.

Origin:
1595–1605; < Medieval Latin immemoriālis. See im-2, memorial

immemorially, adverb


timeless, ancient, ageless, olden.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
immemorial (ˌɪmɪˈmɔːrɪəl)
 
adj
originating in the distant past; ancient (postpositive in the phrase time immemorial)
 
[C17: from Medieval Latin immemoriālis, from Latin im- (not) + memoriamemory]
 
imme'morially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

immemorial
c.1600, from Fr. immémorial (16c.) "old beyond memory," from M.L. immemorialis, from in- "not" + memorialis (see memorial). Something immemorial is ancient beyond memory; something immemorable (1550s) is not memorable.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

immemorial

see time immemorial.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
For time immemorial, humanity has strived to have an intimate relationship with
  this alternate experiential reality.
Hence it is that, from time immemorial, she has sought some form of family
  limitation.
In the rest of the world the stream of life still flowed as it had flowed for
  immemorial years.
Since time immemorial, would-be aviators have tried to fly by mimicking birds
  and bees.
Idioms & Phrases
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