it means "The Morning Star" its an old norse word also used in the inheritance cycle by christopher paolini who based his "ancient language" on the old norse language
look here for more detail (http://inheritance.wikia.com/wiki/Ancient_Language)
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"Aiedail" does not have a specific meaning in English. It could be a proper noun or a term in a different language. Additional context would be needed to provide a more specific explanation.