Definition of quantum leap
: an abrupt change, sudden increase, or dramatic advance
Examples of quantum leap in a sentence
Prices have taken a quantum leap upward.
The new drug is a quantum leap in the fight against cancer.
First Known Use of quantum leap
QUANTUM LEAP Defined for English Language Learners
Definition of quantum leap for English Language Learners
: a sudden large change, development, or improvement
Seen and Heard
What made you want to look up quantum leap? Please tell us where you read or heard it (including the quote, if possible).