The next day after today; tomorrow, or poetically, the future.
From Old English 'morgen' (morning), related to Old Norse 'morginn.' Originally meant 'morning,' but shifted to mean 'the morning of the next day,' then simply 'next day.'
'Morrow' is one of those archaic-sounding words that was once everyday speech. 'See you on the morrow!' meant 'See you tomorrow!' We still use it in poetry and 'good morrow' (good morning) survived into Shakespeare.
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