A duplicated compound referring to a roster or directory of members, likely from web interface terminology.
Modern compound of 'member' from Latin 'membrum' (limb, part) and 'list' from Old English 'liste' (border, strip). The duplication suggests either a technical error or emphasis in digital contexts where member directories are common interface elements.
This doubled term likely emerged from web development contexts where 'memberlist' buttons or links might be repeated for navigation purposes. The duplication could represent either a copy-paste error or intentional emphasis in user interface design, reflecting how digital terminology sometimes creates linguistic redundancies.
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