IPA: /ɑːrˈkaɪvəl/
KK: /ɑrˈkaɪvəl/
Related to or suitable for keeping records or documents that are preserved for their historical value.
The museum has an archival collection of photographs from the early 20th century.
Archival → It is formed from "archivum" (from Latin, meaning a public record or official documents) and the suffix "-al" (meaning pertaining to). The word "archival" refers to something that pertains to or is related to archives or official records.
Think of 'archives' as official records, and remember that 'archival' means related to those records.