"overnight" in the adjective sense
1. nightlong, all-night, overnight
lasting, open, or operating through the whole night
"a nightlong vigil"
"an all-night drugstore"
"an overnight trip"
"overnight" in the adverb sense
1. overnight
during or for the length of one night
"the fish marinates overnight"
2. overnight
happening in a short time or with great speed
"these solutions cannot be found overnight!"
Source: WordNet® (An amazing lexical database of English)
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