Nighty-night definitions

nī'tē-nīt'
Nighty-night is defined as a baby-talk word that means "good night."

An example of nighty night is what you might say to your son as you tuck him into bed.

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interjection
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(colloquial, usually childish) Alternative spelling of nighty night.
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(colloquial, usually childish) Good night.
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Origin of nighty-night

Reduplication of night -y