Correctly or properly, an archaic or poetic way of saying something was done right or turned out well.
From 'a-' (Old English prefix meaning 'in or on') plus 'right.' In Old and Middle English it was common, but it became archaic as 'rightly' and 'correctly' replaced it in standard speech.
Reading 'aright' in old texts shows how prefixes change: 'a-' used to be everywhere (afire, aflame, athirst), but modern English stripped most of them away. It's like watching a language simplify in real time!
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