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immemorial

adjective/ˌɪməˈmɔːriəl/

C1CEFR level
55/100Rarity: uncommon
LiteraryRegister

Extending back beyond memory, record, or knowledge.

The pilgrimage followed a route worn smooth by feet since time immemorial.

Similar: ancient, age-old

Origin: From medieval Latin immemorialis 'not within memory'.

Topic: antiquity in General English

Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.

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More general words: antiquity