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Old English ealdor
Old English ealdorlēas (link)
Middle English aldermon (link)
Middle English eldir (link)
Proto-Germanic *aldraz (inherited)
Proto-Germanic *aldrą (inherited)
Old High German altar (cognate)
Proto-Indo-European *h₂el- (derived)
Old Norse aldr (cognate)
Old Saxon aldar (cognate)

English alderman (mention)
English borsholder (mention)
Old English ealdorleas (suffix)
Old English ealdormann (compound)
Faroese aldur (mention)
Old High German altar (cognate)
Icelandic aldur (mention)
Old Norse aldr (cognate)