Morning; the early part of the day from sunrise to noon, or the early part of anything.
From Old English 'morgen,' related to German 'Morgen' and Old Norse 'morginn.' The word likely connects to the idea of 'the beginning,' as morning is when the day begins.
Morn is an old-fashioned poetic way to say 'morning'—you'll see it in Shakespeare and romantic poetry because it's shorter and sounds more musical. Language is constantly evolving, and words like 'morn' that were once common have become rare outside of poetry and fantasy literature.
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