One of the mysteries of the English language finally explained.
‘A thing done between others’: denoting proceedings, a transaction, etc., to which a given person or entity was not party.
Late 17th century; earliest use found in George MacKenzie (?1638–1691), lawyer and politician. From post-classical Latin res inter alios acta ‘a thing done between others’ from classical Latin rēs thing + inter + aliōs, masculine accusative plural of alius another, other + ācta, feminine of past participle of agere to do.
res inter alios acta/ˌreɪz ɪntə(r) ˌalɪɒs ˈaktə/
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