Etymology
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night-light (n.)

1640s, "faint light visible in the sky at night," from night + light (n.). As "small light used in rooms at night to keep them from total darkness" from 1851.

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Definitions of night-light

night-light (n.)
light (as a candle or small bulb) that burns in a bedroom at night (as for children or invalids);
From wordnet.princeton.edu