a big jump [= bound]:
He threw a stick into the river and the dog went after it in a flying leap.
a large increase or change
quantum/great/huge etc leap
a quantum leap (=very great increase or change) in population levels
a 16% leap in pre-tax profits
the huge leap forward that took place in the 1980s
if something increases, develops, grows etc by leaps and bounds, it does it very quickly:
Lifeboat technology has advanced by leaps and bounds.
4 also an imaginative leap
a mental process that is needed to understand something difficult or see the connection between two very different ideas
something you do without knowing what will happen as a result
something you do even though it involves a risk, hoping that it will have a good result