› an empty space or opening in the middle of something or between two things: Picking up speed, she closed the gap between them. She has a gap between her front teeth. › A gap can be a period in which something does not happen: After a gap of five years, Juanita decided to go back to work full-time. › A gap can also be something lacking: Some people read to fill in gaps in their education. › A gap can also be a difference between people: He was trying to bridge the gap between elders and youth, the middle class and poor.