Before revision: Most sources, including the Oxford English Dictionary , the American Heritage Dictionary of the English Language, and Merriam-Webster's Collegiate Dictionary, define a learning curve as the rate at which skill is acquired, so a steep increase would mean a quick increment of skill.
After revision: Most sources, including the Oxford Dictionary of English , the American Heritage Dictionary of the English Language, and Merriam-Webster's Collegiate Dictionary, define a learning curve as the rate at which skill is acquired, so a steep increase would mean a quick increment of skill.