←
West Frisian iepen (cognate)
←
Proto-Indo-European *up (derived)
←
Icelandic opinn (cognate)
←
Low German apen (cognate)
←
Low German open (mention)
←
Old Norse opinn (derived)
←
Swedish öppen (cognate)
→
Icelandic opinn (mention)
→
Norwegian Bokmål åpne (link)
→
Norwegian Bokmål åpenbar (suffix)
→
Norwegian Bokmål åpenhet (suffix)