Etymology
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tonight (adv.)

Old English toniht "in the coming night," from to "at, on" (see to) + niht (see night). As a noun, "in the night after the present day," early 14c. Written as two words until 18c., after which it was to-night until early 20c.

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Definitions of tonight
1
tonight (n.)
the present or immediately coming night;
2
tonight (adv.)
during the night of the present day;
drop by tonight
Synonyms: this evening / this night
From wordnet.princeton.edu