Definition of tomorrow

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to·mor·row    (t-môr, -mr) KEY 

NOUN:

1. The day following today.
2. The future.

ADVERB:

On or for the day following today: "I won't think of it now.... I'll think of it tomorrow" (Margaret Mitchell).

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ETYMOLOGY:
Middle English to morow, from Old English t morgenne, in the morning : t, at, on ; see to + morgenne, dative of morgen, morning