Meaning of EXPONENTIAL in English

EXPONENTIAL

[adjective](specialized) 64 is an exponential expression (= contains an exponent).(formal) We are looking for exponential growth in our investment (= very fast growth achieved by multiplying the amount of money by itself).(formal) There has been an exponential (= very fast) increase in world population this century.

Cambridge English vocab.      Кембриджский английский словарь.