As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- a. along the whole extent of, from one end to the other (ríða um endilangt herað); ok lagðist þar ~, at full length; um endilangt, at endilöngu, lengthways.
Possible runic inscription in Younger Futhark:ᛁᚾᛏᛁᛚᛅᚾᚴᚱ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.