archival

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ar·chi·val

A0409200 (är-kī′vəl)adj. Of, relating to, kept in, or suitable for archives: "An archival material should have a neutral or slightly alkaline pH; it should also ... have good aging properties" (Artist's Magazine).
Thesaurus
Adj.1.archival - of or relating to or contained in or serving as an archivearchival - of or relating to or contained in or serving as an archive
Translations
αρχειακόςarchivisticoархивный