The definition of all nighter refers to an evening where you don't ever go to bed but instead where you stay up until morning.
A marathon study session that begins on one day and lasts until the morning of the next day is an example of an all nighter.
Informal something that lasts through the night, as a work or study session or a party
A project or event lasting all through the night, especially an intense bout of study or work: pulled an all nighter to finish the assignment on time.
- Alternative spelling of all-nighter.
- Something that lasts throughout the whole night.
- That party was an all-nighter.
All-night + -er.