of or pertaining to archives or valuable records; contained in or comprising such archives or records.

1840–50; archive + -al1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
archive (ˈɑːkaɪv)
1.  a collection of records of or about an institution, family, etc
2.  a place where such records are kept
3.  computing data transferred to a tape or disk for long-term storage rather than frequent use
4.  to store (documents, data, etc) in an archive or other repository
[C17: from Late Latin archīvum, from Greek arkheion repository of official records, from arkhē government]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Its value lies mainly in its discovery, the product of experience, a good eye
  and meticulous archival research.
Her archival research and attention to detail is exemplary.
It will serve as an archival site celebrating books.
Second, personnel files and other archival data had to corroborate veterans'
  reports of trauma.
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