exponentialex·po·nen·tial /ˌekspəˈnenʃəl◂/ adjectiveadj ECONOMICS exponential growth/increase/rise etc a rate of growth that becomes faster and faster over timeTropical diseases are becoming more common in affluent parts of the world due to an exponential increase in air travel during the past fifty years.
The social security budget was rising at an exponential rate.
—exponentially adverbadvDemand for eye tests from the over-60s is increasing exponentially.