Learner's definition of GAP
a space between two people or things
a hole or space where something is missing
a part or period in which nothing happens
a difference between two people, groups, or things
— often + between
see also credibility gap, generation gap
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]