Archaic or dialectal form meaning in the daytime or during the day.
From 'a-' prefix (at/in) plus 'day'; represents Old English 'on dæg' contracted over centuries into this single adverbial form.
This word shows how English compressed 'at day' into 'aday' just like we now compress 'at one' into 'atone'—it's a language constantly shrinking and repacking its own parts.
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