As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
efna Old Icelandic word can mean:
- (-da, -dr), v. to perform, fulfil (~ orð sín, sætt, heit);
- refl., ~st, to turn out in a certain way (efndist þat ok vel; þat efnist opt illa).
- (að), v. to prepare, make arrangements for a thing (e. til vetrsetu, veizlu kaupstaðar).
Possible runic inscription in Younger Futhark:ᛁᚠᚾᛅ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.