As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- (-s, -ar), m. oath; vinna, sverja eið, to take (swear) an oath; rjúfa eið, to break an oath; ganga til eiða, to proceed to the taking of oaths; eigi verðr einn eiðr alla, a single oath does not clear all men.
Possible runic inscription in Younger Futhark:ᛁᛁᚦᚱ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.