What is the meaning of Overnight?

During or throughout the night, especially during the evening or night just past.

In a very short (but unspecified) amount of time.

Occurring between dusk and dawn.

Complete before the next morning.

For which participants stay overnight.

To stay overnight; to spend the night.

To send something for delivery the next day.

An item delivered or completed overnight.

An overnight stay, especially in a hotel or other lodging facility.

Viewership ratings for a television show that are published the morning after it is broadcast, and may be revised later on.

The fore part of the previous night; yesterday evening.

Source: wiktionary.org