or all-night·er (ôl'nī'tər) n.Informal 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.
1.n. something that lasts all night, like a party or study session. After an all-nighter studying, I couldn't keep my eyes open for the test. 2.n. a place of business that is open all night. We stopped at an allnighter for a cup of coffee. 3.n. a person who often stays up all night. I'm no all-nighter. I need my beauty sleep, for sure.