Part of speech: adverb

During or through the night.

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Usage examples "overnight":

  1. Evidently, however, it was only another story of a lucky break and an overnight fortune- a common occurrence these days. - "Flowing Gold", Rex Beach.
  2. She felt lonely without him, for he had never before been away from home to stay overnight. - "Herbert Carter's Legacy", Horatio Alger.
  3. I hear their feet overtaking me, brisk and resolute, as though a revelation had come to them overnight, and so now they know what to do, undiverted by any doubt. - "Waiting for Daylight", Henry Major Tomlinson.