Learner's definition of GAP
1 a : a space between two people or things b : a hole or space where something is missing 3 : a part or period in which nothing happens 4 : a difference between two people, groups, or things — often + between
There is a widening gap between the rich and the poor.
We hope to close the gap between well-funded suburban schools and the struggling schools in poorer communities.
His work bridges the gap between popular fiction and serious literature. [=his work has qualities of both popular fiction and serious literature]